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Question
Evaluate: `(11/-9 xx 21/44) + ((-5)/9) xx (63/-100)`
Solution
`(11/-9 xx 21/44) + ((-5)/9) xx (63/-100)`
`= (11/-9 xx 21/44) + (5/9 xx 63/100)`
`= -(1 xx 7)/(3 xx 4) + (1 xx 7)/(1 xx 20) = - 7/12 + 7/20`
`= - (7 xx 5)/(12 xx 5) + (7 xx 3)/(20 xx 3)`
(∵ L.C.M. of 12 and 20 = 60)
`= - 35/60 + 21/60 = (- 35 + 21)/60 = (- 14)/60`
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