Question
In a class, the ratio of number of boys to number of
girls is 14:9. If 3 boys joined the class and 3 girls left the class, then the ratio becomes 5:3. Find the actual number of girls in the class.Solution
Let initially the number of boys and girls be 14x and 9x, respectively.
(14x + 3) : (9x − 3) = 5 : 3
Or, 3(14x + 3) = 5(9x − 3)
Or, 42x + 9 = 45x − 15
Or, 3x = 24 ⇒ x = 8
Therefore, number of girls = 9 × 8 = 72
{(23.65 × 35.12) ÷ 6.97} + 179.86 = ? × 14.76
What approximate value should come in the place of question mark in the following questions?
25.02% of 460.02 + ?% of 300.02 = 295.21
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
(2520.33 ÷ 41.67) × (√168.88 + √80.78) - 10% of 1499.85 = ?
What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)...
26.23 × 31.82 + 44.8% of 1200 + ? = 1520
66.05 × 17.95 – 38.99 × 18.12 = (60 + ?) × 6
If cosec (2A + B) = (2/√3) and cosec (A + B) = √2, find the value of (4A - B) .
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