Question
The incomes of A and B are in the ratio 4 : 5 and their
expenditures are in the ratio 7 : 9. If each saves Rs 4,000 per month, find B’s monthly income.Solution
ATQ, Let A’s income = 4x, B’s income = 5x Let A’s expenditure = 7y, B’s expenditure = 9y Savings: For A: 4x − 7y = 4000 …(1) For B: 5x − 9y = 4000 …(2) Subtract (1) from (2): (5x − 9y) − (4x − 7y) = 0 x − 2y = 0 ⇒ x = 2y Substitute in (1): 4(2y) − 7y = 4000 8y − 7y = 4000 ⇒ y = 4000 Then x = 2y = 8000 B’s income = 5x = 5 × 8000 = 40,000.
[(40)2 ÷ 32 × 4] ÷ 50 = ?
3.55 + 1.05 + 2.5 × 13 – 12% of 12.5 = ?
(0.1 × 0.2 × 0.3) + (0.3 × 0.4 × 0.5) =?
Find the Value of 1/8 + 999 (71/72) × 9
What will come in the place of question mark (?) in the given expression?
354 - 388 + 342 = ? - 84 ÷ 14 X √484
- What will come in place of (?), in the given expression.
(28 × 4) + (96 ÷ 4) – 25 = ? ((0.1)3+ (1.8)3+ (1.1)3 - 0.3 ×1.8 ×1.1)/((0.1)2+ (1.8)2+ (1.1)2- (0.18)- ...
540 ÷ 6 + 25 % of 120 + ? * 8 = 72 * √9
18% of 200 - 16% of 150 = ?
Simplify the following expressions and choose the correct option.
[(7/8 of 256) ÷ 4] + (3/5 of 150) = ?
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