question_answer

One quality of wheat at Rs. 9.30 per kg is 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?

A) Rs. 10.30

B)  Rs. 10.60

C)  Rs. 10.80

D)  Rs. 11

Correct Answer: C

Solution :

Let the rate of the second quality be Rs. x per kg. \[\therefore \] \[\frac{100x-1000}{70}=\frac{8}{7}\]\[\Rightarrow \]\[700x-7000=560\] \[\Rightarrow \]\[700x=7560\]\[\Rightarrow \]\[x=\] Rs. 10.80