What will come in place of question mark (?) in the following number series?
8000, 1600, ?, 192, 96, 57.6Observing the pattern,
⇒ 1600/8000 = 0.2
⇒ ?/1600 = x
⇒ 192/x = y
⇒ 96/192 = 0.5
⇒ 57.6/96 = 0.6
⇒ x = 0.3 and y = 0.4
∴ ? = 1600 × 0.3 = 4801. What should come in place of question mark ‘?’ in the following series? 4, 18, 48, 100, ?
2. What should come in place of question mark (?) in the following question? 361 × 350 ÷ 70 = 25 × ?
3. What will come in place of question mark (?) in the following question? 35 × 35 ÷ 70 + 16 × 50 = ?
6. If 3x + 7 = x2 + M = 7x + 5, what is the value of 120% of M?