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Level 2

BC = 9 ; BD = 49 ; 1 AC + 1 AD = 1 AB \text{BC} = 9; \text{BD} = 49; \dfrac{1}{\text{AC}} + \dfrac{1}{\text{AD}} = \dfrac{1}{\text{AB}} .

Calculate AB + CD \text{AB + CD} .

This is part of the series: " It's easy, believe me! "


The answer is 61.

Thành Đạt Lê by Thành Đạt Lê , 17, Singapore

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1 solution

Saksham Jain
Nov 12, 2017

let AB be x AC=9+x AD=49+x CD=40 solve equation given in question AB=21 therefore, ans is 61

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