Cold test of fat is a measure

30% of 180 + 248 ÷ ? - √256 = 10²

[5 X {(52 X 5) - 10} + 50 of 20] = ?

Find the value of (x + y)² - (x - y)², where x = 15 and y = 7.

Find the unknown value of' x' in the proportion $$(5x + 1) : 3 = (x + 3) : 7

[{70 + (40 - 22) ÷ 3} ÷ 4] = ?

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

(70 × 8 ÷ 10) × 5 = ?

25% of 300 + √(?) = 35% of 600 - 15% of 300

25% of {(5/18) × 2880 + 12² } = ?% of 590

(880 ÷ 11 + 170) X ? = 40% of 1000