Which of the following materials is used for the

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

(50 × 6 ÷ 12) × 9 = ?

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

? = 70% of 36% of (25 × 320) + 150

2/5 of 3/4 of 7/9 of 7200 = ?

555.05 + 55.50 + 5.55 + 5 +0.55 = ?       

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

60% of 120 – ?% of 64 = 20% of 200

Find the value of 16 x [(8 - 5) of 12 ÷ 4].

(√784 ×20+ √4225 ×14)/(√1764 ×5) = ?

5.45% of 1854 – 37.5% of 1096 = ? – 48% of 630