15, 30, 30, 20, 10,

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

(6³ - ?) ÷ 5 + √625 = 19 X (9 - 6)

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

(40/25) X 80 - ? = 45% of 300 - 55

25.6% of 250 + √? = 119

1220 ÷ 61 ÷ 5 + 450 of 20% - 70 = √ ?

Simplify the expression:

(5x + 15) / (x² + 3x)

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

435 ÷ 29 X 792 ÷ 44 = √(? + 14) + 3⁵ + 221 ÷ 17

192.251 + 326.233 + 125.021 + 19.273 = ?

36% of 640 – 12.5% of 352 + 25% of 640 = ? – 48% of 432

Simplify the following expressions and choose the correct option.

18 * 15 - {3/5 of 250 + 7²}