20. One
quantity of wheat at Rs 9.30 per Kg are mixed with another quality at a certain
rate in the ratio 8:7. If the mixture so formed be worth Rs 10 per Kg ,what is
the rate per Kg of the second quality of wheat?
Solution: Let the
rate of second quality be Rs x per Kg.
C.P
of 1Kg wheat of 1st 980p C.P of 1 Kg
wheat of 2nd 100x p
Mean Price 1000p
100x-1000p 70 p
(100x-1000)
/ 70 = 8/7
700x
-7000 = 560
700x
= 7560 =>x = Rs 10.80.
Therefore
the rate of second quality is Rs10.80
