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Q21. 18 women can complete a work in 12 days and 12 men can complete the same work in 9 days. In how many days will 8 men and 8 women complete that work
(A) 12 days
(B) 9 days
(C) 15 days
(D) 5 days
Answer: 9 days
Explanation: 1 woman’s 1 day’s work = 1 / (12 x 18 ) = 1/216. 1 man’s 1 day’s work = 1/ (12 x 9 ) = 1 / 108. ( 8 men + 8 women)’s 1 day’s work = ( 8/108 ) + 8 / 216 ) = (2 / 27 ) + (1/27 ) = 3 / 27 = 1/9. So 8 men and 8 women will complete the work in 9 days
Q22. The difference between the selling price and cost price of an article is Rs. 50 . If the profit percentage is 20 %, find the cost price
(A) Rs. 350
(B) Rs. 150
(C) Rs. 200
(D) Rs. 250
Answer: Rs. 250
Explanation: . Cost price = 50/0.20 = Rs. 250
Q23. Find the least number exactly divisible by 12 , 15 , 20 and 27
(A) 540
(B) 640
(C) 500
(D) 380
Answer: 540
Explanation: Required number = L.C.M of 12 , 15 , 20 , 27. Hence, required number is 540.
Q24. A car covers a distance of 120 km in 2 hours. How much distance will it cover in 5 hours at the same speed?
(A) 250 km
(B) 400 km
(C) 300 km
(D) 500 km
Answer: 300 km
Explanation: Distance covered = 120/2 × 5 = 300 km
Q25. If the circumference of a circle is 44 cm, find its radius
(A) 14
(B) 7
(C) 21
(D) 28
Answer: 7
Explanation: . Radius = 44/(2×3.14)=7 OR 2×22/7×r=44, so, r =7