Question
The monthly incomes of A and B are in the ratio 3 : 4,
and their monthly expenditures are in the ratio 2 : 3. If each of them saves Rs. 4,000 per month, what is A’s monthly income?Solution
ATQ, Let incomes be 3a and 4a. Let expenditures be 2b and 3b. Savings: 3a − 2b = 4000 ...(1) 4a − 3b = 4000 ...(2) Multiply (1) by 3: 9a − 6b = 12000 Multiply (2) by 2: 8a − 6b = 8000 Subtract: (9a − 6b) − (8a − 6b) = 12000 − 8000 => a = 4000. A’s income = 3a = 3 × 4000 = Rs. 12,000.
(29.98% of 9840) + ? + (19.899% of 8490) = 7560
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.)...
19.912 - (599.98 - 96.01 ÷ 3.01) ÷ 1.98 = ? + √254
( 1000)1/3 × 10.11 × 4.97 ÷ 10.32 =? – 15.022
30.05% of 1279.98 - ? x 4.06 = 8.082
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.)...
13³ + 1.3² + 1.03¹ + 1.003 = ?
9.992 + (5.01 × 4.98) + ? = 225.03
25.902 × 78.095 + 999.996% of 200.08 + 20.005 % of 7999.997 = ? × 15.008 × 33.009
[54.96 × √99.96 – {(25.02/6.84)% of 280.24}]/(3.032 × 19.87) = ?
