how would i solve this step by step?

[small nest]

Well let the Charlie’s number be x
Apply the 60%
0.6x
Form an equation
0.6x=120
Solve for x

[marble swan]

You can also use percentages

60% = 120

Try and find 1%

You can do that by going from 60% to 1%

By diving by 60

What you do to one side, you do to the other

120/60 = 2

1% = 2

The just find 100%

so 1% x 100 = 100%

2 x 100 = 200