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?  Choose one
A) 40  B) 35  C) 55  D) 60  E) 70
Amount 70arned by P,Q and R in 1 day = 1620/9= 
<gadget id="calculator">1620/9</gadget>
<output>180</output>
180 ---(1)   Amount 70arned by P and R in 1 day= 600/5= 
<gadget id="calculator">600/5</gadget>
<output>120</output>
120 ---(2)   Amount 70arned by Q and R in 1 day= 910/7= 
<gadget id="calculator">910/7</gadget>
<output>130</output>
130 ---(3)   (2)+(3)-(1)=&gt; Amount 70arned by P , Q and 2R in 1 day   - Amount 70arned by P,Q and R in 1 day = 120+130-180= 
<gadget id="calculator">120+130-180</gadget>
<output>70</output>
70=&gt;Amount 70arned by R in 1 day = 70   Answer is 70.
<result>E</result>
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?