Important Word Problems Questions for SBI Clerk, IDBI Executive and SBI PO 2018
Q.1 Three pipes M, N and O together can fill a tank in 10 hours. All the pipes are opened together and then after 4 hours pipe N are closed and remain part is filled by pipe M and O in 9 hours. In how many times will the tank be filled by pipe N?
(A) 25 hours
(B) 30 hours
(C) 15 hours
(D) 18 hours
(E) 32 hours
Q.2 The average salary of 5 friends is Rs 25000. If the salary of the 6^{th} friend is added the average remains same. What is the average salary of the 6^{th} friend?
(A) Rs 20000
(B) Rs 18000
(C) Rs 21000
(D) Rs 25000
(E) Rs 30000
Q.3 The simple interest accrued on a sum that is Rs x is 4800 in 4 years at a rate of 16% per annum. What would be the compound interest accrued on (x+2500) at the rate of 15% per annum in 2 years?
(A) Rs 3825
(B) Rs 2925
(C) Rs 3225
(D) Rs 4225
(E) None of these
Q.4 The length of the train is 270 meter. It can cross a platform in 51 seconds and a pole in 27 seconds. Find the length of the platform.
(A) 240 meter
(B) 300 meter
(C) 120 meter
(D) 270 meter
(E) None of these
Q.5 After two successive raises Meetali’s income became equal to 154/125^{th} of her initial salary. If the second rise is 10%, find the % of the first raise.
(A) 15%
(B) 12%
(C) 20%
(D) 25%
(E) 10%
Answer 1. (B) 30 hours
Explanation:
Pipe M, N and O’s 10hour work = 1
Pipe M, N and O’s 4hour work = 4/10 = 2/5
Remain Part = 1 – 2/5
= 3/5
Pipe M and O can fill the 3/5^{th} part in 9 hours.
So Pipe M and O can fill the full tank in 9 × 5/3 = 15 hours
Pipe N can fill the tank in 1 hour = 1/10 – 1/15 = 1/30
So Pipe N can fill the full tank in 30 hours.
Answer 2. (D) Rs 25000
Explanation:
Total salary of 5 friends = 5 × 25000 = Rs 125000
Let the salary of 6^{th} friend = Rs x
According to the question,
125000 + x = 6 × 25000
X = 150000 – 125000
X = Rs 25000
Answer 3. (C) Rs 3225
Explanation:
S.I. = P × r% × t
4800 = P × 16% × 4
P = 7500
New Principal = 7500 + 2500 = Rs 10000
A = P × (1 + 

)^{t} 
A = 10000 × (1 + 

)^{2} 
A = 13225
Compound Interest = 13225 – 10000
= Rs 3225
Answer 4. (A) 240 meter
Explanation:
Train can cross a pole in 27 seconds
So the Speed of the train = 270/27 = 10 m/s
Let the length of platform = x meter
S = D/t
10 = (270 + x)/ 51
510 = 270 + x
x = 510 – 270
x = 240 meter
Answer 5. (B) 12%
Explanation:
Let the salary = 125 Rs
After raise salary = 154 Rs
Let the First rise = x%
According to the question,
125 × 110% × (100 + x)% = 154
11 (100 + x) / 8 = 154
100 + x = 112
x = 112 – 100
x = 12%