help help help | Mathematics | Page 1

leaden moonBOT May 17, 2023, 4:44 PM

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kindred canyon May 17, 2023, 4:44 PM

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please help i cant do it

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theres no way to do it

molten patrol May 17, 2023, 4:46 PM

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So all the small rectangles are equal right?

kindred canyon May 17, 2023, 4:46 PM

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ursj

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yeah

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there are 13 copies of them to make a bigger version of the rectangle

molten patrol May 17, 2023, 4:47 PM

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Okay so

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We already know the long side of the small rectangles is 30mm

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You can know the length of the big rectangle from that (30*4)

kindred canyon May 17, 2023, 4:48 PM

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yep

molten patrol May 17, 2023, 4:49 PM

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And then he other side of the big rectangle is 30 + 2x (x is the other side of the small rectangle)

kindred canyon May 17, 2023, 4:49 PM

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but how can we work out x?

molten patrol May 17, 2023, 4:49 PM

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We know the big rectangle area is equal to the area of 13 small ones

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So 13 * 30 * x = 30 * 4* (30+2x)

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We alright till here or no?

kindred canyon May 17, 2023, 4:51 PM

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yep

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i get it so far

molten patrol May 17, 2023, 4:52 PM

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so 390 * x = 120 * (30+2x)

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390x = 3600 + 240x

kindred canyon May 17, 2023, 4:53 PM

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150x = 3600?

molten patrol May 17, 2023, 4:53 PM

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Subtract 240x from both sides and you’ll get
150x = 3600

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Yeah

kindred canyon May 17, 2023, 4:53 PM

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yaaay

molten patrol May 17, 2023, 4:53 PM

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Then devide both sides by 150

kindred canyon May 17, 2023, 4:53 PM

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2.4

molten patrol May 17, 2023, 4:53 PM

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No way

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It’s more than 20

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Like 24

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Haha

kindred canyon May 17, 2023, 4:54 PM

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oh

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i put a decimal place

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oopsies

molten patrol May 17, 2023, 4:54 PM

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alright so

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We know the other side of the small rectangle now

kindred canyon May 17, 2023, 4:54 PM

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24 x 30 x 13

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9360

molten patrol May 17, 2023, 4:55 PM

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Yep

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High five

kindred canyon May 17, 2023, 4:55 PM

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🤲

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high five

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tysm for helping me

molten patrol May 17, 2023, 4:56 PM

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You’re welcome

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Which grade is this by the way?

kindred canyon May 17, 2023, 4:56 PM

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9

molten patrol May 17, 2023, 4:56 PM

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Oo

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Okay

kindred canyon May 17, 2023, 4:56 PM

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we doing ratios now

molten patrol May 17, 2023, 4:56 PM

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Nice

kindred canyon May 17, 2023, 4:56 PM

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equivilant ratios

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i kinda get it

molten patrol May 17, 2023, 4:56 PM

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Cool

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I don’t really understand math in English haha

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cuz I study it in arabic

kindred canyon May 17, 2023, 4:57 PM

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oh

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a : 6 : 7 = 8 : 24 : b

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i think a = 3 and b = 4

molten patrol May 17, 2023, 4:58 PM

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: means divided by?

kindred canyon May 17, 2023, 4:58 PM

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its for ratio

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like

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ratio of 3 : 4

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3 apples every 4 oranges

molten patrol May 17, 2023, 4:58 PM

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Ah

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okay

kindred canyon May 17, 2023, 4:59 PM

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this one is the hardest question

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the teacher set it for us and whoever can solve it gets

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prize

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its grade 10 level

molten patrol May 17, 2023, 5:00 PM

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Well

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I don’t wanna make you cheat haha

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But if you know how percentage works and can solve a simple equation with a variable x like we did above, then you can solve this, I believe in you 🙂

kindred canyon May 17, 2023, 5:01 PM

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yep

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i think i can do it

molten patrol May 17, 2023, 5:01 PM

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Goodluck

#help help help