Excel in arithmetic questions for SI exam
By Banda Ravipal Reddy Hyderabad: This article is in continuation to the last article on preparation for the Sub-Inspector of Police recruitment exam. Here are some practice questions and answers along with explanations on the percentage topic. 1. The population of a town increases by 5% annually. If its population in 2001 was 1,38,915, what […]
By Banda Ravipal Reddy
Hyderabad: This article is in continuation to the last article on preparation for the Sub-Inspector of Police recruitment exam. Here are some practice questions and answers along with explanations on the percentage topic.
1. The population of a town increases by 5% annually. If its population in 2001 was 1,38,915, what it was in 1998?
A. 1, 00,00 B. Rs.11,372 C. Rs.1,20,000 D. Rs.12,500
Ans: C
Explanation:
Let the present population of a town be P and suppose it increases at the rate of R% per annum, then:
Population T years ago = P/ (1=R/100)T
P=1,38,915 , R=5%, t=3.
Population in 1998 is = 138915/ (1 5/100) 3
= 138915 × 20/21 × 20/21 × 20/21 =1,20,000
2) 15% of 45% of a number is 105.3. What is 24% of that number?
A. 285.5 B. 374.4 C. 390 D. 375
Ans: B
Explanation:
Let the number be x.
Of of x = 105.3
X =
Of x = 1560 ×
= 374.4
3) Ravi spent Rs. 35,645 on buying a bike,Rs. 24,345 on buying a television and the remaining 20% of the total amount he had as cash with him. What was the total amount?
A. 60,000 B. 72,000 C.75,000 D. 80,000
Ans: C
Explanation:
Let the total amount be x
According to the question of x = 35,645 24,345
× x = 60,000
× 60,000 = x = 75,000.
4. Harsha decided to spend 45% of her salary on shopping. On completion of shopping she realized that she spends Rs. 11,475 which was 60% of what she had decided to spend. How much is her salary?
A. Rs. 29,600 B. Rs. 38,800 C. Rs. 42,500 D. cannot be determined
Ans: C
Explanation:
Salary of Harsha = 11475×□(100/60)×□(100/45) = 42,500
5) Neha spent Rs. 38,460 on the renovation of her house, Rs. 24,468 on buying home-theater and the remaining 28% of the total amount she had in cash with her. What was the total amount?
A. Rs. 92,600 B. Rs. 76,500 C. Rs. 87,400 D. cannot be determined
Ans: C
Explanation:
Let the total amount be x
x – 38460 – 24468 = 28/100x
x – 28x/100 = 38460 24468
= Rs. 87,400
6) Prema decided to donate 15% of her salary to an orphanage. On the day of donation, she changed her mind and donated Rs. 1896 which was 80% of what she was decided earlier. How much is her salary?
A. Rs. 18,500 B. Rs. 10,250 C. Rs. 15,800 D. can’t be determined
Ans: C
Explanation:
Let the salary be x
X × × = 1896
x =
= Rs. 15,800
7) A sum of Rs. 2,236 is divided among A, B and C such that A receives 25% more than C and C receives 25% less than B. What is A’s share in the amount?
A. Rs. 460 B. Rs. 890 C. Rs. 780 D. Rs. 1,280
Ans: C
Explanation:
Let the share of B be x
According to the question
Share of C = x × = 3/4th x
Share of A = ×
= Rs.
Share of A = Rs. 780
Director, SIGMA
SaiInstitute of General Mental Ability
Hyderabad
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