book Maths Puzzle Numerical Ability

Ten people can paint 60 houses in 120 days, so five people can paint 30 houses in:

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book Other Question

if x= the sum of 9% of 21..then wut would the product of 23x equal if no quotient was present for no percentage? I dont quite understand ow to solve this problem.

Solve for a H=18t+1/2at(this last t is supposed to be squared)