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

Please help w/ the following:
Find the rational roots of F. List any irrational roots correct to two decimal places.
f(x)= x^4+7x^3+x^2-35x-30
Thank you. is there every a time when a value is a solution to both inequality and an equation