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16. A boy travels in a scooter after covering 2/3rd of the distance the wheel got punctured he covered the remaining distance by walk. Walking time is twice that of the time the boy’s riding time. How many times the riding speed as that of the walking speed ?
a. 2 times
b. 4 times
c. 3 times
d. 5 times
(b)
17. A man sold 2 pens. Initial cost of each pen was Rs. 12. If he sell it together one at 25% profit and another 20% loss. Find the amount of loss or gain, if he sells them separately.
a. 50 paise gain
b. 40 paise loss
c. 60 paise loss
d. 55 paise loss
(c)
18. 125 small but identical cubes are put together to form a large cube. This large cube is now painted on all six faces. How many of the smaller cubes have no face painted at all.
a. 27
b. 64
c. 8
d. 36
(a)
19. Two pipes P and Q can fill a tank in 24 minutes and 27 minutes respectively. If both the pipes are opened simultaneously, after how much time should B be closed so that the tank is full in 8 minutes?
a. 14 minutes
b. 12 minutes
c. 15 minutes
d. 18 minutes
e. None of these
(d)
20. In how many different ways can the letters of the word ‘MATHEMATICS’ be arranged so that the vowels always come together?
a. 10080
b. 4989600
c. 120960
d. None of these
(c)