61. A juice container was 4/5 full. Ravinder poured 4 glasses from it and then poured two glasses back. The container is 3/4 full now. How many glasses can be filled if the entire container of juice is emptied?
Answer: 40
Explanation:first it was (4/5) 80% full then after filling 2 glass it is (3/4) 75% full
Thus every 5% means 2 glass
Therefore 100% can fill (100/5)*2 = 40 glasses
Workspace
Cognizant
62. A constructor estimates that 3 people can paint Mr khans house in 4 days. If he uses 4 people instead of 3,how long will they take to complete the job?
Answer: 3
Explanation:Formula M1*D1 = M2*D2
3*4 = 4*x
=> x = 3 days
Workspace
Cognizant
63. simple interest on an amount at 4% per annum for 13 months is more than the simple interest on the same sum for 8 months at 6% per annum by Rs. 40. what is the principle amount
Answer: 12000
Explanation:Lets assume principle ammount = Rs. x
[(P*4*13/100*12) - (p*6*8/100*12)] = 40
=> p=12000
Workspace
Cognizant
64. A tv manufacturer has decided to increase the sale to beat the economic slow down it decides to reduce the price of tv sets of 25% as a result of which the sales increased by 20 % what is the effect on total revenue of company
Answer: Decrease by 10%
Explanation:Lets assume cost price of T.V = Rs. 100
so,marked price of T.V = Rs. 75
=> Final price = 120% of 75 = Rs. 90
Hence, Decrease in price = (100-90) = 10
Decrease by 10%.
Workspace
Cognizant
65. a) A boat travels 300m up stream in 15 minutes
b)Its speed down stream is 8/5 times its speed upstream
Which of the options provide the correct realationship between speed of current and speed of
Answer: Speed of current=3/13 times of speed of boat
Explanation:In 15 mins boat travels 300 mtr
So, in 60 mins=(300*4)=1200mtr
So, (u-v)=1200
Thus we get (u+v)=1920
Sloving this two equation we get u=1560 and v=360
Now (v:u)=360:1560=3:13
Workspace
Cognizant
66. If an integer k is divisible by 2,5 and 13, what is the next largest number that is divisible by all the three given numbers ?
Answer: k+130
Explanation:k+ LCM of 2,5,13
=> (k + 130)
Workspace
Cognizant
67. A salesman has the liberity to sell a hair dryer in his store at a price between Rs. 300 and Rs. 700. Profit earned by selling the hair dryer for Rs. 650 is twice the loss incurred when it is sold for Rs. 350. What is the cost price of the hair dryer ?
Answer: Rs. 450
Explanation:Lets assume loss = Rs. X
So Loss x = C.P - S.P
=> X=C.P-350 -----------(1)
2X=650-C.P ------------- (2)
By solving the above eq. (1) & (2)
=> C.P = Rs. 450
Workspace
Cognizant
68. A train runs at a speed of 42 m/s and takes 35 seconds to pass a tunnel. After travelling some distance it takes 15 seconds to pass a pole. What is the length of the tunnel?
Answer: 840m
Explanation:Length of tunnel+length of train = 42*35 m
Length of train = 42*15 m
Length of tunnel = 42*35 m - 42 *15 m = 42 *(35-15)m = 840 m
Workspace
Cognizant
69. What is the least amount that a person can have, such that when he distributes it into groups of Rs.16 or Rs. 18 or Rs. 20 or Rs. 25, he is always left with Rs. 4?
Answer: Rs. 3604
Explanation:Find the lcm of 16 18 20 and 25 i.e 3600.
so the amount is (3600 + 4) = Rs. 3604
Workspace
Cognizant
70. what is the least number by which 16,800 must be divided to get a number perfect square
Answer: 42
Explanation:16,800/42=400
400=(20)^2
Workspace
Cognizant
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