The price of 80 apples is equal to that of 120 oranges. The price of 60 apples and 75 oranges together is Rs. 1320. The Total price of 25 apples and 40 oranges is:

If a + b + c = 12, a² + b² + c² = 52, then what is ab + bc + ca equal to-

(53×87+159×21+106×25) is equal to 

The sum of a positive integer and its square is 2450. The positive integer is : 

Simplify the following equations.
1 ÷[{p²/(p+6)}+{6p/(p+6)}]

What approximate value should come in place of the question mark (?) in the following question? 
21.9714 × (8.8749 - 4.9393) = ?

What should come in place of the question mark (?) in the following question?
19.5% of 524 = 50% of ?