Question
The average age of three children is 20 years. If their
ages are in the ratio 5:6:9. Find the age of the youngest child.Solution
Total age of three children = 20 × 3 = 60 years Let their ages be 5x, 6x and 9x respectively. => 5x + 6x + 9x = 60 => 20x = 60 => x = 3 Therefore the age of youngest child = 5 × 3 = 15 years
More Average Questions
64.5% of 800 +  36.4% of 1500 = (?)² + 38
√256 * 3 – 15% of 300 + ? = 150% of 160
82% of 400 + √(?) = 130% of 600 - 85% of 400
25% of 140 + 2 × 8 = ? + 9 × 5
- What will come in place of the question mark (?) in the following questions?
120÷(5×2)+8=? 4.7 × 3.5 + 4.2 × 4.5 = 22.5 × 3.5 - ?
180 ÷ 3 of 2 = 102 – ?
36 × 15 + 20% 1250 = ? + 296
(1296)Â -3/4Â = ?
