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# The length a person can jump is inversely proportional to his weight…

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**The length a person can jump is inversely proportional to his weight. If a 20kg person can jump 1.5m, find the constant of proportionality.**

**A. 30****B. 20****C. 15****D. 60**

**QUICK ANSWER…**

**A**

**SOLUTION****… **** **

**Let length = L, and weight = W,**

**L ****α 1/W**

**L = K/W**

**LW = K**

**Hence, 1.5 ****×**** 20 = K = 30**

**Now for the right answer to the above question:**

**Option A is correct.****Option B is incorrect.****C is incorrect.****D is not the correct answer.**

**QUICK TIPS…**

**You may please note the****se/this****:**

**Constant k is usually introduced when the sign of proportionality is removed.**

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**/ culled from 2015 JAMB-UTME mathematics past question 15 /**