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What Number: When Decreased by 15% Becomes 170? - Mathematics

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Question

What number: When decreased by 15% becomes 170?

Sum
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Solution

Let the number be = 100

Increase = 15% = 15

∴ Decreased number = 100 - 15 = 85

If decreased number is 85, then original number = 100

and if decreased number is 170, then original number `= 100/85 xx 170 = 200`

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Chapter 8: Percent and Percentage - Exercise 8 (C)

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Selina Concise Mathematics [English] Class 7 ICSE
Chapter 8 Percent and Percentage
Exercise 8 (C) | Q 4.3
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