Question

Evaluate: `(7/8 xx 24/21) + ((-5)/9 xx 6/-25)`

Answer 1

`(7/8 xx 24/21) + ((-5)/9 xx 6/-25)`

`=> (7 xx 24)/(8 xx 21) + (- 5 xx 6)/(9 xx (-25))`

`=> (1 xx 3)/(1 xx 3) + (1 xx 2)/(3 xx 5)`

`=> 3/3 + 2/15`

3	3, 15
5	1, 5
	1, 1

 

 

 

(∵ L.C.M. of 3 and 15 = 15)

`=> (3 xx 5)/(3 xx 5) + (2 xx 1)/(15 xx 1)`

`=> (15 + 2)/15 = 17/15 = 1 2/15`