exam Maths Puzzle Numerical Ability

How do you factor by grouping, xy - 3x - 8y + 24, whats the answer?

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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 One number is 5 more than another number. Three times the first plus twice the second is 30.Find the numbers.