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The ratio of amount for two years under CI per annum and for one year under SI is 4/3, when the rate of interest is same, Find the rate of Interest ?

Correct

Explanation :
Note : SI for 1 year = CI for 1 year
P(1+r/100)2 /P(1+r/100) = 4/3
1+ r/100 = 4/3
r/100 = 4/3 -1 = 1/3
r = 100/3 = 33 1/3

Incorrect

Explanation :
Note : SI for 1 year = CI for 1 year
P(1+r/100)2 /P(1+r/100) = 4/3
1+ r/100 = 4/3
r/100 = 4/3 -1 = 1/3
r = 100/3 = 33 1/3

Question 7 of 10

7. Question

1 points

Category: Quantitative Aptitude

If a river flowing at 3kmph, a boat travels at 40km upstream and then returns downstream to the starting point. If its speed in still water is 5kmph, Find the total journey time ?

Correct

Explanation :
D = t(x2-y2)/2x
40 = t(52 – 32)/2×5
400 = 16t
T = 25

Incorrect

Explanation :
D = t(x2-y2)/2x
40 = t(52 – 32)/2×5
400 = 16t
T = 25

Question 8 of 10

8. Question

1 points

Category: Quantitative Aptitude

The sum of ages of 4 members of a family 5 years ago was 80year. Now the daughter has been married off and replaced by a daughter-in-law, the sum of their ages is 94 years. What is the difference between the ages of daughter and daughter-in-law ?

Correct

Explanation :
Present Sum of their ages with daughter = 80+20 = 100
Present Sum of their ages with daughter-in-law = 92
Difference = 100 -94 = 6 yr

Incorrect

Explanation :
Present Sum of their ages with daughter = 80+20 = 100
Present Sum of their ages with daughter-in-law = 92
Difference = 100 -94 = 6 yr

Question 9 of 10

9. Question

1 points

Category: Quantitative Aptitude

The average weight of 32 students in a class was calculated as 27kg. It was later found that the weight of two students in a class was wrongly added. The actual weight of one boy was 30kg, but it was calculated as 28kg and the weight of another boy in the class was 21 whereas it was calculated as 25kg. Find the difference between original average weight and calculated average weight ?

Three pipes A , B and C can fill a tank in 8 hours , After working it at together for 2 hours , C is closed and A and B can fill the remaining part in 8 hours . How much time will C take alone to fill the tank?

Correct

Explanation :
In 2 hour the part filled by all the three pipes = 2 X 1/8 = 1/4
Remaining part = 1 – 1/4 = 3/4, which is filled by ( A + B ) in 8 hours.
1 hour the part filled by ( A + B ) = 3/(4 x 8) = 3/32
1 hour the part filled by C alone = 1/8 – 3/32= 4-3/32 = 1/32

Incorrect

Explanation :
In 2 hour the part filled by all the three pipes = 2 X 1/8 = 1/4
Remaining part = 1 – 1/4 = 3/4, which is filled by ( A + B ) in 8 hours.
1 hour the part filled by ( A + B ) = 3/(4 x 8) = 3/32
1 hour the part filled by C alone = 1/8 – 3/32= 4-3/32 = 1/32