Question

Evaluate:

`5/21 - (-13)/42`

Answer 1

2	21, 42
3	21, 21
7	7, 7
	1, 1

LCM of 21, 42 = 2 x 3 x 7 = 42

`= (5xx2)/(21xx2) - (-13xx1)/(42xx1)`

LCM of 21 and 42 = 42)

`= (10+13)/42 = 23/42`