exam Maths Puzzle Numerical Ability

find the LCM for 4 and 20

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exam Other Question

a rectangular box is (4x +3) feet wide, (5x - 2) feet long, and (3x + 2) feet high find the volume of this box. I am trying to solve these equations by substitution or elimination amd then I have to interpret the result. Each time I do it, my solution comes out to 0. Can someone help me understand this?

2x+4y=10
3x+6y=12