What least number must be added to 6834 to get a number

Find the simplified value of the given expression:

8 of 7 ÷ 2 × 5² + √36 – 10

What will come in the place of question mark (?) in the given expression?

3.6 X 15 + 4.5 X 12 = 40% of (? - 50)

Simplify the expression and find the value of 'x'

35% of 500 of 18 ÷ 21 = x

7.4 × 8.2 + 3.5 × 4.5 = ? + 11.5 × 2.5

1 + 1 + 1/2+ 1/3 + 1/6 + 1/4 is equal to ____

What will come in the place of question mark (?) in the given expression?

(144 × 16 ÷ 12) × 6 = ? 

What value should come in place of (?) question mark in the given expression.

√324 + √225 × 3 − 5² = ?

What will come in place of (?) question mark in the following expression.

(12³ ÷ 6²) × 15 - 120 = ?

15 * 12 + 35% of 80 + 70% of 130 = ?