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P,Q and R together earn Rs.1620 in 9 days. P and R can earn Rs.600 in 5 days. Q and R in 7 days can earn Rs.910. How much amount does R can earn per day?

Rs.40
Rs.70
Rs.90
Rs.100
Explanation:

Amount Earned by P,Q and R in 1 day = 1620/9 = 180 ---[1]

Amount Earned by P and R in 1 day = 600/5 = 120 ---[2]

Amount Earned by Q and R in 1 day = 910/7 = 130 ---[3]

$\left(2\right)$+$\left(3\right)$-$\left(1\right)$ => Amount Earned by P , Q and 2R in 1 day

Amount Earned by P,Q and R in 1 day = $\left(120+130\right)$-180 = 70

=>Amount Earned by R in 1 day = 70

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