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Cocubes
Tot. Mock Test: 73+
Tot. Exam. Sec.: 5+
Total Practice Qs: 137+
131 / 137
If a man earns Rs20 on first day and spends Rs15 on second day, and earns Rs20 on third day and spends Rs 15 on fourth day and goes on. On which day he will be having Rs 60.
A13th Day
B15th Day
C16th Day
D17th Day
Answer: Option D
Explanation:Earns Rs20 on first day and spends Rs15 on second day means,
End of day 2, he have 5Rs.
Therefore,
In 16days he have 40Rs
2 * 8 = 16days
5rs* 8 = 40Rs
And On the 17th day again he earn Rs.20,
40 + 20 =60Rs.
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132 / 137
Rita is twice as old as Rama. Three years ago, she was three times as old as Rama. How old is Rita now?
A10 years
B12 years
C14 years
D16 years
ENone of above
Answer: Option B
Explanation:If present age of Rita=x & Rama=y, then
x=2y ---(i) &
x-3=3*(y-3) or x-3y=-6 ---(ii)
On solving (i) & (ii), x=12, y=6
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133 / 137
Some person bought something at loss for Rs 60. He then sold it for the the price of 81 and his profit was 20% of the loss. At what price did he buy the object.
A73
B71.5
C77.5
D76
Answer: Option C
Explanation:lets Assume loss be Rs x on Rs 60
Cost Price = 60+x
He then sold it the price of 81 and his profit was 20% of the loss
60+x + 20%x = 81
Solving this x will be 17.5
Cost Price = 60 + x = 60 + 17.5 = 77.5
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134 / 137
There is a clock which shows false timing ie it shows 10 minutes less for each 1 hour. If the clock shows 12 noon now how many minutes will be lost when it shows 3 pm?
A36 minutes
B30 minutes
C45 minutes
D40 minutes
ENone of above
Answer: Option A
Explanation:For 1 hour, 10minutes is slower, then for
06 miuntes - 1 minutes is slower
30 minutes - 5 minutes
Actual time false time
12 12
01 PM 12.50 PM (10 minutes slower)
02 PM 01.40 PM (12.50 + 60 min - 10 minutes slower)
03 PM 02.30 PM (01.40 + 60 min - 10 minutes slower)
03.36 PM 03.00 PM (02.30 + 36 min - 6 minutes slower )
So, 36 minutes will be lost when it is showing 3.00 PM. and the actual time is 3.36 PM
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135 / 137
An air conditioner can coo 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?
Aabout 22 minutes
Babout 20 minutes
Cabout 30 minutes
Dabout 25 minutes
ENone of above
Answer: Option A
Explanation:A cools at 40min other at 45min together = (45*40)/85 = 21.1764 = about 22 min
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136 / 137
A passenger train takes two hours less for a journey of 300km if its speed is increased by 5 kmph from its normal speed. The normal speed is
A35 kmph
B50 kmph
C25 kmph
D30 kmph
Answer: Option C
Explanation:let normal speed = x
Increased speed = x + 5
Initialy, x = 300/t1
t1 = 300/x
After, (x + 5) = 300/(t1 - 2)
(x + 5) = 300 / [ (300/x) - 2]
x = 25kmph
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137 / 137
There are 25 Horses which all run at different speeds. A faster horse always beats a slower horse. You can race 5 horses at a time. There are no ties and you may not time them. What is the minimum number of races needed to determine the 3 fastest horses in order from fastest to slowest.
A3
B7
C9
D10
ENone of above
Answer: Option B
Explanation:Minimum 7 races required.
A1 B1 C1 D1 E1
A2 B2 C2 D2 E2
A3 B3 C3 D3 E3
A4 B4 C4 D4 E4
A5 B5 C5 D5 E5
Consider the above five races first to find top (A1,B1,C1,D1,E1). Lets race top 5 (5+1 now). We say winners are (A1 B1 C1).
Here A1 is absolute top to all. There is a possiblity where B1 might be slower than A2,A3,A4,A5.
So Race B1, A2, A3, A4, A5 (Now 5+1+1 = 7). If A3 beats B1, top hourses are A1,A2,A3.
Please let me know if the explanation suits.
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