: Practice questions for SI exams #IndiaNEWS #Education By Banda Ravipal Reddy Hyderabad: This article is in continuation to the last article on preparation for the Sub-Inspector of Police recruitment

Practice questions for SI exams #IndiaNEWS #Education
By Banda Ravipal Reddy
Hyderabad: This article is in continuation to the last article on preparation for the Sub-Inspector of Police recruitment exams. Here are some practice questions and answers on ratio and proportion along with explanations.
1) The price of a scooter and a television set are in the Ratio 3:2. If a scooter costs Rs. 10,000 more than the television set, Then the price of a scooter is(SI 2016)
a) 30,000 b) 40, 000 c) 45,000 d) 50,000
Ans: A
Explanation:
The prices of a scooter and television set are in the ratio 3:2. If a scooter cost
Rs. 10000 more than the television set.
Let the price of the scooter be Rs. 3x and the price of television set Rs. 2x.
Difference = 3x – 2x = x = Rs. 10000
The price of the scooter = 3×10000 = Rs. 30000
2) x: y = 3: 4, them (7x 3y): (7x – 3y) =? (SI 2018)
a) 5: 2 b) 4:3 c) 11:3 d) 37:19
Ans: c
Explanation:
x: y = 3:4 x/y=3/4
7x 3y/7x-3y
Divide every term with y
7(x/y) 3 / 7(x/y)-3=7(3/4) 3 / 7(3/4)-3
= = = 11 : 3
Short cut method:
x: y= 3: 4
directly substitute x=3 and y=4 in the given equation i. e. , 7x 3y/7x-3y
= 7(3) 3(4)/ 7(3)-3(4) = 21 12 / 21-12
= 33/9 = 11/3 = 11 : 3
3) a: b = 1:2, b:c=3:5, c:d = 5: 4 and e:d = 5: 6then a:b:c:d:e =
(SI 2018)
a) 3: 6 :10 :8 :7 b) 9: 18:30: 24 :20 c) 15: 30:50:40: 48
d) 1: 2: 3: 4: 5
Ans: b
Explanation:
There is a simple way of doing these kinds of problems by multiplying both sides with multiples of a number make a particular variable common in both the ratio
A:B = 1: 2, B:C = 3: 5
Now multiply A:B with 3 and multiply B:C with 2
Then A:B = 3:6 and B:C = 6:10
Now combining both A:B:C = 3:6: 10
Again C:D = 5: 4
Now multiplying A:B:C with 1 and C:D with 2
Then A:B:C = 3: 6: 10
and C:D = 10: 8
Now combining the above two
A:B:C:D = 3: 6: 10: 8
Again E: D = 5:6��OM��
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