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A combination of locks requires three numbers to open. The second number is 2d+5 greater than the first number. The third number is 3d-20 less than the second number. The sum of the three numbers is 10d+9. The first number is:

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5 d - 11

3 d - 7

2 d + 19

3 d - 11

answer is B.

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Detailed Solution

Concept- Solve linear equation by arithmetic progression
Let first number be

Second no. be

Third number be

So, their sums be

This implies
Question Image

Hence, the correct answer is option 2.

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