Quantitative Aptitude :: Percentage Problems And Answers

34. On my sister's 15th birthday, she was 159 cm in height, having grown 6% since the year before. How tall was she the previous year?

A. 150 cm B. 160 cm
C. 170 cm D. 140 cm
Answer & Explanation

Answer: Option A

Explanation:
Given that height on 15th birthday = 159 cm and growth = 6%
Let the previous year height = x
Then height on 15th birthday = x × (100 + 6)/100 = x × 106/100
⇒159 = x × 106/100 
⇒x = 159 × 100/106 = 1.5 × 100 = 150 cm


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