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Question 1 of 5
1. Question
6 men can do a piece of work in 12 days. How many men are needed to do the work in 18 days
Correct
Ans. (c)
Here Man. Day = 6 x 12 = 72
m x 18= 72, m = (72/18) = 4
Incorrect
Ans. (c)
Here Man. Day = 6 x 12 = 72
m x 18= 72, m = (72/18) = 4
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Question 2 of 5
2. Question
Manoj takes twice as much time as Ajay and thrice as much as Vijay to finish a piece of Work. Together they finish the work in 1 day. What is the time taken by Manoj to finish the work?
Correct
Ans. (a)
M:A:V
2:1:2/3 or 6:3:2
Let Manoj takes 6x days Ajay takes 3x days
and vijay 2x days then 1/6x +1/3x+1/2x = 1
1/x[1/6+1/3+1/2]=1
1/x=1
So x = 1
Manoj will take 6 days
Incorrect
Ans. (a)
M:A:V
2:1:2/3 or 6:3:2
Let Manoj takes 6x days Ajay takes 3x days
and vijay 2x days then 1/6x +1/3x+1/2x = 1
1/x[1/6+1/3+1/2]=1
1/x=1
So x = 1
Manoj will take 6 days
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Question 3 of 5
3. Question
At present, the ratio of the ages of Maya and Chhaya is 6:5 and fifteen years from now, the ratio will get changed to 9:8 Maya’s present age is
Correct
Answer : c
Let the present ages of Maya and Chhaya are 6x and 5x yr, respectively.
According to the question,
After 15 yr,
[(6x+15)/(5x+15)] = (9/8)
48x +120=45x +135
3x = 15
∴x = 5
Hence, present age of Maya = 5×6 = 30 yr
Incorrect
Answer : c
Let the present ages of Maya and Chhaya are 6x and 5x yr, respectively.
According to the question,
After 15 yr,
[(6x+15)/(5x+15)] = (9/8)
48x +120=45x +135
3x = 15
∴x = 5
Hence, present age of Maya = 5×6 = 30 yr
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Question 4 of 5
4. Question
In a family, the average age of father and mother is 35 yr. The average age of the father, mother and their only son is 27 yr. What is the age of the son?
Correct
Answer : b
Because Total age of father and mother = 35x 2 =70 yr
And total age of father, mother and son = 27 x3 = 81 yr
∴Age of son = 81 – 70 = 11 yr
Incorrect
Answer : b
Because Total age of father and mother = 35x 2 =70 yr
And total age of father, mother and son = 27 x3 = 81 yr
∴Age of son = 81 – 70 = 11 yr
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Question 5 of 5
5. Question
The ratio between the present ages of A and B is 4:5. If the ratio between their ages 4 yr hence becomes 14:17, then what is B’s age at present?
Correct
Answer : a
Let the ages of A and B are 4x and 5x yr, respectively
According to the question,
According to the question,
(4x+4)/5x+4) =(14/17)
68x+68 = 70x +56
2x = 12
X=6
Hence, present age of B = 5 x 6 = 30 yr
Incorrect
Answer : a
Let the ages of A and B are 4x and 5x yr, respectively
According to the question,
According to the question,
(4x+4)/5x+4) =(14/17)
68x+68 = 70x +56
2x = 12
X=6
Hence, present age of B = 5 x 6 = 30 yr
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