#Ratio
4 messages · Page 1 of 1 (latest)
Well, let's see.
Suppose we buy B packs of bread rolls and C packs of cheese slices. Then we get a system:
20C = 2(15B) (twice as many cheese slices as bread rolls)
20C ≥ 101 (more than 100 sandwiches, so more than 100 slices; as both are integers, this is equivalent to 101 or more)
And the total price is P = 1.91B + 2.23C.
First, let's simplify the system a bit.
2C = 3B
C ≥ 101/5
C needs to be an integer. The smallest integer ≥ 101/5 is 21.
Suppose C = 21. Then B = (2/3)C = 14. B also needs to be an integer, so this works.
So, now just substitute B = 14, C = 21 into the price formula: P = 1.91B + 2.23C.
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