book Maths Puzzle Numerical Ability

What is the prime factorization of the number 20

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book Other Question

If 40rpm = 29kg How many rpm = 40 kgs

gven 29 kgs = 40 rpm therefore
1 kg = 40 divided by 29 = 40/29
40 kgs = 40/29 multiplied by 40 = 1600/29 = 55.17 kgs
Linear Systems

w+2x+3y-4z=-5
2w-x+y-2z=-7
3w-x-2y+z=7
4w-4x-2y+3z=3