Maths Practice Question and Answer
8 Q: A shopkeeper gains 20 percent by giving a discount of 10 percent of the marked price of a toy. If he had given a discount of 20 percent, then what would be his profit percentage?
1675 05f9be27ad433054b5ca00be6
5f9be27ad433054b5ca00be6- 1$$ {6\ {2\over 3}}$$true
- 2$$ {8\ {1\over 3}}$$false
- 310false
- 415false
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Answer : 1. "$$ {6\ {2\over 3}}$$"
Q: If two numbers are respectively 20% and 50% of a third number, what is the percentage of the first number to the second?
1675 0605860ea4789ef0456dbc1f3
605860ea4789ef0456dbc1f3- 110false
- 220false
- 330false
- 440true
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Answer : 4. "40"
Q: A semicircle is folded to make a cone. Find the height (in cm) of the cone if diameter of the semicircle is 28 cm?
1675 0601a4f64552e5f41f7b07047
601a4f64552e5f41f7b07047- 1$$ {7\sqrt{3}}$$true
- 2$$ {14\sqrt{3}}$$false
- 3$$ {7\sqrt{5}}$$false
- 4$$ {7\sqrt{13}}$$false
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Answer : 1. "$$ {7\sqrt{3}}$$"
Q: ‘A’ alone can complete a work in 6 days and “B” can complete this work alone in 8 days. They can complete this work in 3 days with the help of C. If they are paid Rs. 6400 for this work, then find the share of C.
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608fb8057748471dd98ce159- 1400false
- 2800true
- 31600false
- 43200false
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Answer : 2. "800"
Q: In bag there are coins of 25 paisa, 50 paisa and 1 rupee in the ratio of 3 : 4 : 5. If there are in all Rs.31, then how many 1 rupee coins are there in the bag?
1675 060c09bcfc197293a48275430
60c09bcfc197293a48275430- 112false
- 216false
- 324false
- 420true
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Answer : 4. "20"
Q: A and B can do a work together in 18 days. A is three times as efficient as B. In how many days can B alone complete the work?
1675 064ccdf41a919c8488e301a5c
64ccdf41a919c8488e301a5c- 160 daysfalse
- 272 daystrue
- 354 daysfalse
- 464 daysfalse
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Answer : 2. "72 days"
Explanation :
Let's denote the work rate of A as "A" and the work rate of B as "B." We know that A is three times as efficient as B, so we can write:
A = 3B
Now, we also know that A and B can do a work together in 18 days. The work rate of A and B combined is the sum of their individual work rates, which can be represented as:
A + B
Since they complete the work in 18 days together, we can write:
(A + B) = 1/18
Now, we want to find how long it would take B alone to complete the work. Let's denote that time as "x" days. The work rate of B alone would be:
B (work rate of B alone) = 1/x
Now, we have two equations:
A = 3B
(A + B) = 1/18
We can substitute the value of A from the first equation into the second equation:
(3B + B) = 1/18
Combine like terms:
4B = 1/18
Now, isolate B by dividing both sides by 4:
B = (1/18) / 4
B = 1/72
So, B's work rate is 1/72 of the work per day. To find how many days B alone can complete the work, take the reciprocal of B's work rate:
x (number of days for B alone) = 1 / (1/72)
x = 72
Therefore, it would take B alone 72 days to complete the work.
Q: At each corner of a triangular field of sides 26m, 28m, and 30m, a cow is tethered by a rope of length 7m. the area unglazed by the cow?
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5ec7ba199d324637e76e6b21- 1336false
- 2259true
- 3154false
- 477false
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Answer : 2. "259"
Q: If the cost of 10 books is ₹250, then find the cost of 15 books.
1675 06413138c86fd416146954936
6413138c86fd416146954936- 1₹125false
- 2₹115false
- 3₹375true
- 4₹215false
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