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71) The compounded ratio of (2 : 3), (6: 11) and (11 :2) is
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72) Find the value of ? mark 1, 2, 3, 10, ?, 9802
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73) An air conditioner can cool the hall in 40 miutes while another takes 45 minutes to cool under similar conditions. If both air conditioners are switched on at same instance then how long will it take to cool the room approximately ?
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74) If 4 (A's capital) = 6 (B's capital) = 10 (C's capital), then out of a profit of Rs. 4650, C will receive ____
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75) 4 men can repair a road in 7 hours. How many men are required to repair the road in 2 hours ?
Explanation :
M x T / W = Constant
where, M= Men (no. of men)
T= Time taken
W= Work load
So, here we apply
M1 x T1/ W1 = M2 x T2 / W2
Given that, M1 = 4 men, T1 = 7 hours ; T2 = 2 hours, we have to find M2 =?
Note that here, W1 = W2 = 1 road, ie. equal work load.
Clearly, substituting in the above equation we get, M2 = 14 men.
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76) In a certain code language, '3a, 2b, 7c' means 'Truth is Eternal'; '7c, 9a, 8b, 3a' means 'Enmity is not Eternal' and '9a, 4d, 2b, 8b' means 'Truth does not perish'. Which of the following means 'enmity' in that language ?
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77) Find at what time between 8 and 9 o'clock will the hands of a clock be in the same straight line but not together ?
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78) Brothers and Sisters I have None :: Looking at a portrait of a man, Harsh said, "His mother is the wife of my father's son. Brothers and sisters I have none." At whose portrait was Harsh looking?
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79) If the cost price of 12 pens is equal to the selling price of 8 pens, the gain percent is ?
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80) ...... is the metal used for making filaments of electric bulbs
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