You could set up a proportion
86/x = 98/100
Then solve for x, I'll do it by cross-multiplying.
86 times 100 divided by 98 = 87.755102
87-88 problems
Answer:
Side A = 11
Side B = 16
Side C = 25
I added an image that shows what I did in case you need it.
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Total amount of cash the student earns per hour is $7.5, let the time taken to earn $200 be h, thus the inequality representing this will be:
7.5h≤200
thus
h≤80/3
writing in whole numbers we shall have:
h≤27
12 cm to 24 cm
the scale factor is 2x