book Maths Puzzle Numerical Ability

Please help me solve this equation: 15x=105 _ and r+27=92_____

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book Other Question

A storeowner buys a quality of balls for $600. If they had each cost $0.25 less, shewould have had 10 more for the same money. How much did she pay for each ball? Factoring Polynomials

f(y) = 5y^2 - 20y