What approximate value should come in place of question mark.
(1814 .9  ÷  121) x 35.78 ÷ 45.1023 = ? 

What is the sum of six hundred nine and four thousand twenty-eight?

What approximate value should come in place of the question mark(?) in the following question.
635×455÷403=?

358.085 + 42.91 + 25.55 = ?

What approximate value should come at place of the question mark(?) in the following question?

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-