Question
The current ages of Aman and
Bishnu are in the ratio 3:4, respectively. Two years ago, Bishnu's age was 40% more than Aman's age at that time. Determine Bishnu's present age.Solution
ATQ, Let the present ages of 'Aman' and 'Bishnu' be '3x' years and '4x' years, respectively. (3x - 2) × 1.4 = (4x - 2) Or, 4.2x - 2.8 = 4x - 2 Or, 0.2x = 0.8 So, x = 4 So, present age of 'Bishnu' = 4x = 4 × 4 = 16 years
If a + b = 56 and (a – b)² = 496, find the value of the product of a and b.
In △ ABC, AB = AC. A circle drawn through B touches AC at D and intersect AB at P. If D is the midpoint of AC and AP = 2.5 cm, then AB is equal to:
1/3 + 1/15 + 1/35 + 1/63 + 1/99 = ?
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