P,Q and R together earn Rs.1980 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? Select the correct option:
A) s.30
B) s.70
C) s.90
D) s.100
E) s.120
Explanation :   s.30mount Earned by P,Q and R in 1 day = 1980/9= 
<gadget id="calculator">1980/9</gadget>
<output>220</output>
220 ---(1)   s.30mount Earned by P and R in 1 day= 600/5= 
<gadget id="calculator">600/5</gadget>
<output>120</output>
120	---(2)   s.30mount Earned by Q and R in 1 day= 910/7= 
<gadget id="calculator">910/7</gadget>
<output>130</output>
130	---(3)   (2)+(3)-(1)=&gt; s.30mount Earned by P , Q and 2R in 1 day   - s.30mount Earned by P,Q and R in 1 day = 120+130-220= 
<gadget id="calculator">120+130-220</gadget>
<output>30</output>
30=&gt;s.30mount Earned by R in 1 day = 30   s.30nswer : Option s.30
<result>A</result>
P,Q and R together earn Rs.1980 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?