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Nine added to thrice a whole number gives 45. Find the number

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Nine added to thrice a whole number gives 45. Find the number

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Let the whole number required be x. 

Thrice the whole number = 3x 

Nine added to it = 3x + 9 

Given 3x + 9 = 45

3x + 9 – 9 = 45 – 9 [Subtracting 9 on both sides] 

3x = 36 

\(\frac{3x}{3}=\frac{36}{3}\)

x = 12 

∴ The required whole number is 12

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