Question

A computer program changed one number into another. The program changes 12 into 9, 20 into 15, and 100 into 75. What number will 60 be changed into?

Answer 1

45, Because all of the ratios between the numbers are 4/3
your left with the equation 60/x=4/3, now simply solve for x.
60/x=4/3 multiply by x
60=4x/3 multiply by 3
180=4x divide by 4
x=45