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Evaluate: - 5 + 5/-8 + (-5)/(-12) - Mathematics

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Question

Evaluate: `- 5 + 5/-8 + (-5)/(-12)`

Sum

Solution

`- 5 + 5/-8 + (-5)/(-12)`

`(- 5)/1+ (-5)/8 + (5)/(12)`

 

`= (- 5 xx 24)/(1 xx 24) + (-5 xx 3)/(8 xx 3) + (5 xx 2)/(12 xx 2)`
(∵ L.C.M. of 1, 8 and 12 = 24)


`= (- 120)/24 + (-15)/24 + (10)/24`


` = (- 120 - 15 + 10)/24 = (- 125)/24`

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Concept for Problem Solving Using Operations on Rational Numbers
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Chapter 2: Rational Numbers - Exercise 2 (C)

APPEARS IN

Selina Concise Mathematics [English] Class 7 ICSE
Chapter 2 Rational Numbers
Exercise 2 (C) | Q 4.3
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