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Inversion Problems (Finding the Number Given the Result)

If 4 is added...

Question

If 4 is added to a number and the sum is multiplied by 3, the result is 30. Find the number.

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Solution

Let the number be x and
Given: when 4 be added to the number x and the sum is multiplied by 3, the result is 30.
i.e., 3(x+4)=30
3x+12=30
3x=30-12
3x=18
Therefore, x=6

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Inversion Problems (Finding the Number Given the Result)

Standard VIII Mathematics

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