IBPS RRB PO 2020 – Daily Math Quiz Day – 1
IBPS RRB PO 2020 – Daily Math Quiz Day – 1
1.Richa‘s age is thrice of Tisha‘s age while Megha‘s age is 3 less than that of Richa‘s. The ratio of ages of Tisha‘s three years hence to Megha‘s four years ago is 3 : 5. What is the square root of the total age of Tisha and Richa?
- A) 36
- B) 25
- C) 6
- D) 13
- E) 18
Answer
1.View Answer
Option C
Solution:
Tisha = x, Richa = 3x, Megha = 3x – 3
(x+3)/(3x-3-4) = 3/5
Solve, x = 9
So total age of Tisha + Richa = x + 3x = 4x = 36, So square root = √36 = 6
2.The population of a town is 15000. It increases by 10 percent in the first year and 20 percent in the second year. But in the third year it decreases by 10 percent. What will be the population after 3 years.
- a) 16820
- b) 15820
- c) 17820
- d) 19820
2.Answer & Explanation
Answer – c) 17820
Explanation :
15000*(11/10)*(12/10)*(9/10) = 17820
3.If there is a loss of 40% when a good is sold at (2/5)th of its earlier selling price. Find the profit% after selling the good at a certain price.
A) 24.15%
B) 31.3%
C) 47%
D 35%
E) 50%
3.Option E
Solution:
CP = (2/3) of SP
SP = (100+P) / 100 of CP
Equating both the above equations,
Profit = 50%
4. 3, 3, 12, 38, 103, ?
1.232
2.221
3.223
4.227
5.242
4.Answer – 4.227
Explanation :
3 + 1³ – 1 = 3
3 + 2³ + 1 = 12
12 + 3³ – 1 = 38
38 + 4³ + 1 = 103
5. √2800 + 38.09% of 749.99 – 35% of 860.009 = ?
A) 26
B) 77
C) 37
D) 25
E) 28
5. Answer
Option C
6. 3020 ÷ 9 ÷ 6 + 66% of 250 – √6245 = ?
A) 284
B) 398
C) 276
D) 233
E) 142
7. I. 3x2 – 32x – 35 = 0,
2y2 + 23y + 45 = 0
A) If x > y
B) If x < y
C) If x ≥ y
D) If x ≤ y
E) If x = y or relation cannot be established
7.Option A
Solution:
x = -7/3, 5
y = -9, -5/2
Put all values on number line and analyze
the relationship
-9……….-5/2……..-7/3…….. 5
8. 71, 90, 128, 185, 261, 365 Find wrong one
a) 365
b) 128
c) 185
d) 90
e) 261
8). A) The series is
71 + 19 = 90, 90 + 38 = .128, 128 + 57 = 185, 185 + 76 = 261, 261 + 95 = 356 Hence there
should be 356 in place of 365
9. A and B each working alone can do a work in 12 and 36 days respectively. They started the work together but A left after sometime and B finished the remaining work in 4 days. After how many days from the start did A leave?
A) 10 days
B) 8 days
C) 12 days
D) 3 days
E) None
- Answer
Option B
Solution:
A 12 3unit(A’s work)
B 36 1unit(B’s work) Both Lcm 36
(whole work)
B work 1 unit per day then for 4 days
4unit.
remaining 36-4=32 unit left that done by
both A and B
Both work unit (3+1) 4
==>32/4===>8days.
10. Speed of a man in still water is 5 km/hr and the river is running at 3km/hr. The total
time taken to go to a place and come back is 10 hours. What is the distance travelled?
A.10 km
B.16 km
C.24 km
D.32 km
E.36 km
10.Answer – D.32 km
Explanation :
Down speed= 5+3= 8
Up speed= 5-3=2
Let distance travelled = X
(X/8)+(X/2)= 10
X= 16 km
Total distance is 16+16=32
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