The technology for producing paracetamol indigenously

Determine the simplified value of the expression: 12 × 15 - 20 + 15 + 12 - 18 + 3 × 4 + 18.

(5/8) x 320 + 100 = ?% of 200 + 90

[(7/8 of 640 - 60% of 300) × (√225 ÷ 5)] ÷ (1/4 of 800) = ?

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

{17 + √2601}/(? + 2) = 17

1549.8 ÷ 8.2 + 65.6 × 55 = (? × 4) + (42 × 30.5)

Calculate the simplified value of the given expression:

35% of 240 – 6 ² = ? ² – √256

1/6+ 999*53/54  ×9  = ?