Question

If x/(x+15) = 4/9, find the value of x. *
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Answer 1

$x \div (x + 15) = 4 \div 9 \\ cross \: multiplication \\ 9x = 4(x + 15) \\ 9x = 4x + 60 \\ 9x - 4x = 60 \\ 5x = 60 \\ x = 12$

Answer 2

x/x+15=4/9

therefore,x/x=4/9+15

x/x=60/9

x=6.66666667