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ATQ,
Let the current ages of David and his uncle be ‘a’ and ‘b’ years respectively.
So, a = (b/2) - 5
Or, b = 2a + 10 ------- (I)
And, a + 6 = 0.25 × (b + 6)
Or, a + 6 = 0.25 × (2a + 10 + 6) [from equation I]
Or, a + 6 = 0.25 × (2a + 16)
Or, a + 6 = 0.5a + 4
Or, 0.5a = 2
Or, a = 4
Required age = 4 + 4 = 8 years
(1/2) – (3/5) + 3(1/3) = ? + (5/6)
36 x 3.6 ÷ 0.5 ÷ ? = 64
360 ÷ 9 + 15 % of 200 + ? * 10 = 45 * √25
36 × 15 + 20% 1250 = ? + 296
(-251 × 21 × -12) ÷ ? = 158.13
29% of 400 + 66% of 1100 - 50% of 1200 = ?
350% of (450 / 1.5) = ?% of 4200
(13)2 + 6 × (19)2 – 312 × 4 = ?