If we increase a number by 20% it becomes 42 then the number is ……………….
If we increase a number by 20% it becomes 42 then the number is ……………….
A) 5
B) 16
C) 10
D) none
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Correct option is (D) none
Let number be x.
\(\therefore\) x + 20% of x = 42
\(\Rightarrow\) \(x+\frac{20x}{100}=42\)
\(\Rightarrow\) \(x+\frac x5=42\)
\(\Rightarrow\) \(\frac{6x}5=42\)
\(\Rightarrow\) \(x=42\times\frac56\) \(=7\times5=35\)
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