One third of a number when added to 20 is 30. Can you find the number?

180

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120

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Solution

The correct option is B
30

Let the number be x

One third of x = $\frac{x}{3}$

Framing the equation, we get

$\frac{x}{3}$ + 20 = 30

Transposing 20, we get

$\frac{x}{3}$ = 30 - 20

$\frac{x}{3}$ = 10

Multiply both sides by 3

x = 30

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