exam Maths Puzzle Numerical Ability

is there every a time when a value is a solution to both inequality and an equation

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exam Other Question

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 The sum of the perimeters of two squares is 40 inches. the sum of their areas is 58 square inches. What are the dimensions of the squares?