exam Maths Puzzle Numerical Ability

Please help me pick the correct answer.

If x-y=6 and 3x^2+3xy-6y^2=60, then 9x+18y=

Answers:
a) 12
b) 15
c) 20
d) 24
e) 30

Read Solution (Total 0)

exam Other Question

You invest 10,000, part at 6% annual interest and the rest at 9% annual interest. If you received 684 in interest after one year, how much did you invest at each rate? Assume that y varies inversely as x. If y = 3.2 when x =0.2, find y when x =1.6