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=2107⇒n=30 Thus, the required number is 30.