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Divide the Sum Ofby the Difference Ofof 3/7and - Mathematics

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Question

Divide the sum of `5/8` and `(-11)/12` by the difference of `3/7` and `5/14`.

Sum

Solution

Sum of `5/8` and `(-11)/12 = 5/8 + ((-11)/12)`

`= 5/8 - 11/12`

`= ((5xx3) - (11xx2))/24`

(LCM of 8 and 12 is 24)

`= (15-22)/24 = (-7)/24`

Now, difference of `3/7` and `5/14`

`= ((3xx2)-(5xx1))/14 "or" (5-(3xx2))/14`

(LCM of 7 and 13 = 14)

`= (6-5)/14 "or" (5-6)/14 = 1/14 "or" (-1)/14`

Now, divide `(-7)/24 "by" 1/14 "or" (-1)/14`

`= ((-7)/24)/(1/14) "or" ((-7)/24)/((-1)/14)`

`= (-7)/24 xx 14/1 "or" (-7)/24 xx (-14)/1`

` = (-49)/12 "or" 49/12 = -4 1/12 "or" 4 1/12`

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Chapter 1: Rational Numbers - Exercise 1 (D) [Page 22]

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Selina Concise Mathematics [English] Class 8 ICSE
Chapter 1 Rational Numbers
Exercise 1 (D) | Q 13 | Page 22
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