How to find value of X, if X plus 20%of X is equal to 105

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I think your question is... Find the new value of X, if it is increased by 20%, and the original value was 150. According to this question, both of the answers are wrong...
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The age of Mohit is 20% more than the age of his sister Saritha, Find the age of Saritha if Mohit is 42 years old.
Yeah... That's what I've written

Answers

2015-02-12T19:38:42+05:30
X +20/100 *X =105
Taking LCM
100X + 20X /100 = 105
120 X = 10500
X = 10500/20
X = 525
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2015-02-12T19:42:48+05:30
X plus 20/100×x =105

x+1/5 x=105

x+x+1=105×5=525

2x=525-1=524

x=262
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