12 yr ago the ratio between the ages of A and B was 3 :4respectively. The present age of A is 3$3 \over 4$ times of C's present age. If C's present age is 10 yr, then what is B's present age? (in years)

A certain number of capsules were purchased for Rs. 216,15 more capsules could have been purchased in the same amount if each capsule was cheaper by Rs.10. What was the number of capsules purchased ?

M, N, O and P divided Rs.44352 among themselves. M took $3 \over 8$th of the money, N took $1 \over 6$th of the remaining amount and rest was divided among O and P in the ratio of 3 : 4 respectively. How much did O get as his share ?

Pure milk costs Rs. 16 per litre. After adding water the milkman sells the mixture Rs. 15 per litre and thereby makes a profit of 25%. In what respective ratio does he mix milk with water?