66. If the wheel of a bicycle makes 560 revolutions in travelling 1.1 km, what is its radius? (use π = ⎯)
7
1) 31.25 cm
2) 37.75 cm
3) 35.15 cm
4) 11.25 cm
5) Other than those given as options

67. Elena’s age after 15 years will be 5 times her age 5 years back. What is her present age?
1) 10 years
2) 37 years
3) 35 years
4) 11 years
5) Other than those given as options

68. A man purchased a cow for ` 3000 and sold it the same day for ` 3600, allowing the buyers a credit of 2 years. If the rate of interest be 10% per annum, then the man has a gain of
1) 5%
2) 0%
3) 20%
4) 10%
5) Other than those given as options

69. A man takes 3 hours 45 minutes to row a boat 15 km downstream a river and 2 hours 30 minutes to cover a distance of 5 km upstream. Find the speed of the stream.
1) 1 kmph
2) 3 kmph
3) 5 kmph
4) 2 kmph
5) Other than those given as options

70. A cistern 6 m-long and 4-m wide contains water up to a height of 1m 25 cm. Find the total area of the wet surface of the cistern.
1) 42 sqm
2) 49 sqm
3) 52 sqm
4) 64 sqm
5) Other than those given as options