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Maths-

SAT

Easy

Question

If 3x = 8y and both x and y are positive, which of the following equals 40y?

$\frac{3}{5} x$
$\frac{5}{3} x$
5x
15x

The correct answer is: 15x

3x = 8y
40y =?
Multiply both sides by 5
(3x)5 = (3y)5
15x = 40y

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