What value will come in place of question mark (?) in the questions given below?

663.48 + 22.51 - 292.63 = ? + 300.44 

What value will come in place of question mark (?) in the questions given below?

837 ÷ ? × 0.8 = 9.3 

Ganesh, Shankar and Sameer invested Rs. 4200, Rs. 8400 and 5400 respectively while starting a business. At the end of the year, they earned a profit of Rs. 24,000. Sameer invested 32% of. his share of the profit in a saving scheme. How much amount he is left with?

The simple interest accrued on an amount of Rs. 8500 at the end of four years is Rs.3400. What would be the compound interest accrued on the same amount at the same rate of interest after three years?

If x tan45° cos30° = sin30° cos45°, then x is equal to - 

In the given fig, find the value of x

A alone can complete a work in 15 days and B alone can complete a work in 25 days. If they work on alternate days starting with A, in how many days the work will be finished?

Directions:  The table given below presents the number of books on different subjects kept on separate shelves subjects with odd and even numbers are of arts and Science respectively

Find the ratio of S1: S7.