book Maths Puzzle Numerical Ability

if x= the sum of 9% of 21..then wut would the product of 23x equal if no quotient was present for no percentage?

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I just want to make sure I got this right. This is a homework test problem not from a book. I need to simplify this equation. I hope this comes out right on the screen.
(4x^3^ay^b Ten people can paint 60 houses in 120 days, so five people can paint 30 houses in: