GMAT Quant Chapter 14: Formula Logic

Question 1

In terms of formula logic, how do you calculate a percentage change in a formula’s output?

Answer 1

New Value – Old Value
/
Old Value
*
100

Question 2

Use algebra to solve:

If the distance an object travels doubles, but the time remains constant, what is the effect on the object’s speed?

Answer 2

s = d / t (original)

s = 2d / t (new)

Therefore, speed has doubled.