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Considering the alarming importance of CSAT in UPSC CSE Prelims exam and with enormous requests we received recently, InsightsIAS has started Daily CSAT Test to ensure students practice CSAT Questions on a daily basis. Regular Practice would help one overcome the fear of CSAT too.
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Question 1 of 4
1. Question
121, 143, 165, 186, 209
Correct
Ans: (c)
165 + 22= 187
Therefore, 187 should be in place of 186.
Incorrect
Ans: (c)
165 + 22= 187
Therefore, 187 should be in place of 186.
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Question 2 of 4
2. 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 x 3 = 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 x 3 = 81 yr
∴Age of son = 81 – 70 = 11 yr
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Question 3 of 4
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 tpo 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 tpo 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 4
4. Question
Number by 18, then what is the sum of these two numbers?
Correct
Answer : d
Let first number =x
and second number = y
According to the question,
x – y = 18 …………………(1)
and 3x – 4y = 18 ………………….(2)
On multiplying Eq. (1) by 3 and then
subtracting Eq. (ii) from it, we get
3x-3y 54
3x-4y = 18
y= 36
On putting the value of y in Eq. (1), we get
x = 18 + y = 18 + 36
x = 54
Required sum = x + y = 54+ 36= 90
Incorrect
Answer : d
Let first number =x
and second number = y
According to the question,
x – y = 18 …………………(1)
and 3x – 4y = 18 ………………….(2)
On multiplying Eq. (1) by 3 and then
subtracting Eq. (ii) from it, we get
3x-3y 54
3x-4y = 18
y= 36
On putting the value of y in Eq. (1), we get
x = 18 + y = 18 + 36
x = 54
Required sum = x + y = 54+ 36= 90
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