Quantitative Aptitude Ques 709

Question: The sum of 15% of a positive number and 10% of the same number is 70. What is twice of that number?

Options:

A) 440

B) 280

C) 560

D) 140

E) None of these

Show Answer

Answer:

Correct Answer: B

Solution:

  • Let the number be $ x. $ $ x\times \frac{15}{100}+\frac{10}{100}\times x=70 $

$ \Rightarrow $ $ 15x+10x=70\times 100 $

$ \Rightarrow $ $ x=\frac{70\times 100}{25}=70\times 4=280 $

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