Question
In how many days 6 girls and 4 boys together can
complete a work? A. 18 girls together can complete a work in 10 days. B. 10 boys can complete three-fourth of the work in 6 days. C. 72 girls and 48 boys together can complete the work in 1 day. Directions – : The following questions are accompanied by three statement A, B and C. you have to determine which statement (s) is /are necessary/ sufficient to answer the question.Solution
From (A), 18 girls can do the work in 10 days. So, 6 girls can do it in `(18 x 10)/(6)` = 30 days. From (B), 10 boys can complete tree-fourth of the work in 6 days. Therefore, 10 boys can do the entire work in 6 x `(4)/(3)` = 8 days. So, 4 boys can do it in `(10 x 8)/(4)` = 20 days. By combining (i) and (ii): Required no. of days = `(30 x 20)/(50)` = 12 days C. (72G + 48 B) =1 12(6G + 4 B) = 1 6g + 4 B = 12 days Hence, either A and B together or C alone is sufficient to answer the question.
15.99% of 549.99 ÷ 11.17 = ? ÷ 20.15
74.91% of 639.95 – 599.98% of 45 + 119.987 = ?
(4.88 × 5.76)2 - ?2 = 39.89 × 19.86
- 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 exactvalue.)
(1800.23 ÷ 29.98) + (816.32 ÷ 23.9) + 1634.11 = ?
1449.98 ÷ 50.48 × 10.12 = ? × 2.16
36.05 × 5.02 + 12.052 = ? + 9.09 × 4.04Â
(31.9)3 + (34.021)² - (16.11)3 - (42.98)² = ?
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