GMAT Question of the day

If X^4+Y^4=100, then the greatest possible value of X is between:

A. 0 and 3

B. 3 and 6

C. 6 and 9

D. 9 and 12

E. 12 and 15

Answer:

X^4+Y^4=100

x^4<100

x^2<10

so the only option that has values is B