book Maths Puzzle Numerical Ability

how do you solve 60=[400/(1+r)^3]

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book Other Question

what is the solution to z/20+1/12=z/15-1/10 and 4W+23/5=19-W/7 solving quadratic equations by factoring:

(x+5)(x+4)=0

2h^2-h-3=0