The sum of 15% of a positive number and 10% of the same number is 70. What is twice of that number? |
A) 440
B) 280
C) 560
D) 140
E) None of these
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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