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Question

Solve the following riddle:
I am a number. Tell my identity!
Take me seven times over and add a fifty! To
Reach a triple century, you still need forty.

A
30
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B
40
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C
50
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D
60
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Solution

The correct option is A 30
Let the number be n.
According to the question, 7n+50+40=300
7n+90=300 7n=300-90
7n=210 n=2107n=30
Thus, the required number is 30.

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