4 boys and three girls are to be seated in a row in such a way that no two boys sit adjacent to each other. In how many different ways can it be done?

(a) 5040

(b) 30

(c) 144

(d) 72

(e) None of these

17. Mr. ‘X’ invested certain amounts in two different schemes ‘A’ & ‘B’. Scheme ‘A’ offers simple interest at 12 p.c.a. and Scheme ‘B’ offers compound interest at 10 p.c.p.a. Interest accrued on the amount invested in Scheme A in 2 years was ` 3600 and the total amount invested was ` 35.000. What was interest accrued on the amount invested in Scheme ‘B’?

(a)Rs.4,800

(b) Rs. 4,200

(c) Rs. 4,000

(d) Cannot be determined

(e) None of these

12 men take 36 days to do a work while 12 women complete 3 th 4 of the same work in 36 days. In how many days 10 men and 8 women together will complete the same work?

(a) 6

(b) 27

(c) 12

(d) Data inadequate

(e) None of these

A grocer purchased 2 kg.of rice at the rate of ` 15 per kg. and 3 kg. of rice at the rate of ` 13 per kg. At what price per kg. should he sell the mixture to earn 1 33 % 3 profit on the cost price?

(a) 28.00

(b) ` 20.00

(c) ` 18.40

(d) ` 17.40

(e) None of these

A boat takes 6 hours to travel from place M to N downstream and back from N to M upstream. If the speed of the boat in still water is 4 km./hr., what is the distance between the two places?

(a) 8 kms.

(b) 12 kms.

(c) 6 kms.

(d) Data inadeqate

(e) None of these

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