exam Maths Puzzle Numerical Ability

This problem was on hand out. I think I solved it correctly, but am not sure.
My answer is 360mn.
thanks for your help.

-60m (-2) (-3n)

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exam Other Question

write equation in slope intercept form

y+1=-7(x+1)
Which of the ordered pairs (3,1),(0,-4),(-4,0),(-3,-7) are solution for the equation

x - y =4?