Maths Practice Question and Answer
8 Q: Sheela’s salary is 60% of Reeta’s salary and 80% of Anshu’s salary. If Reeta’s salary is Rs. 16000, what is the difference between the salary of Sheela and Anshu?
1770 05eb010438d1f47273b1d3c46
5eb010438d1f47273b1d3c46- 1Rs. 2000false
- 2Rs. 2600false
- 3Rs. 2400true
- 4Rs. 2800false
- 5Rs. 2000false
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Answer : 3. "Rs. 2400 "
Q: The least number which when divided by 4, 6, 8, 12 and 16 leaves a remainder of 2 in each case is:
1770 05de63499c873ec70a678bd63
5de63499c873ec70a678bd63- 146false
- 248false
- 350true
- 456false
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Answer : 3. "50 "
Q: A sum of money becomes 3 times in 12 years. In how many years it will become 5 times at the same rate of simple interest?
1770 060990bd6c4aedb3e8066a196
60990bd6c4aedb3e8066a196- 120 yearsfalse
- 216 yearsfalse
- 324 yearstrue
- 430 yearsfalse
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Answer : 3. "24 years "
Q: If x1 and x2 are the roots of the equations bx2-ax + log2my=0 such that x12=a2+x22 then evaluate the roots in terms of a and b.
1769 0600e929e377d750b4eb49c40
600e929e377d750b4eb49c40- 1$$ {a\over2ab}{(a^{2}+1)},{a\over2ab}{(1-b^{2})}$$true
- 2$$ {a\over2b}{(b^{2}+1)},{a\over2b}{(1-a^{2})}$$false
- 3$$ {a\over2ab}{(b^{2}-1)},{a\over2ab}{(1-b^{2})}$$false
- 4$$ {a\over2b}{(b^{2}+1)},{a\over2b}{(1-b^{2})}$$false
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Answer : 1. "$$ {a\over2ab}{(a^{2}+1)},{a\over2ab}{(1-b^{2})}$$"
Q: The sum of weights of A and B is 80 kg. 50% of A's weight is $${5\over6}$$ times the weight of B. Find the difference between their weights.
1769 064ccef6ba919c8488e304799
64ccef6ba919c8488e304799- 120 kgtrue
- 210 kgfalse
- 325 kgfalse
- 415 kgfalse
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Answer : 1. "20 kg"
Explanation :
Let's denote the weight of A as 𝑥x kg and the weight of B as 𝑦y kg.
Given:
- 𝑥+𝑦=80x+y=80 (Sum of weights of A and B is 80 kg)
- 0.5𝑥=56𝑦0.5x=65y (50% of A's weight is 5665 times the weight of B)
We can solve these two equations to find the values of 𝑥x and 𝑦y, and then calculate the difference between their weights.
From equation 2: 0.5𝑥=56𝑦0.5x=65y Multiply both sides by 2 to get rid of the fraction: 𝑥=56𝑦×2x=65y×2 𝑥=106𝑦x=610y 𝑥=53𝑦x=35y
Now substitute this expression for 𝑥x into equation 1: 53𝑦+𝑦=8035y+y=80 83𝑦=8038y=80 Multiply both sides by 3883: 𝑦=80×38y=80×83 𝑦=30y=30
Now that we have found the weight of B, we can find the weight of A using equation 1: 𝑥+30=80x+30=80 𝑥=80−30x=80−30 𝑥=50x=50
So, the weight of A is 50 kg and the weight of B is 30 kg.
Now, let's find the difference between their weights: Difference=Weight of A−Weight of BDifference=Weight of A−Weight of B Difference=50−30Difference=50−30 Difference=20Difference=20
Therefore, the difference between their weights is 20 kg.
Q: In a school, number of girls is 75% of number of boys. Difference between boys and girls is 30. On a particular day 20% girls were absent, then find the number of girls those who present?
1769 05e9da1d03212a83ffa647bc9
5e9da1d03212a83ffa647bc9- 118false
- 290false
- 342false
- 4168false
- 572true
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Answer : 5. "72 "
Q: The lateral surface area of a cylinder is 792cm2. If its height is 14cm, then its volume (in cm3) is? [Take π = 22/7 ]
1769 0606d5678556643278a79a9ae
606d5678556643278a79a9ae- 12564false
- 23929false
- 31243false
- 43564true
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Answer : 4. "3564"
Q: A wall is the form of a trapezium with height 8 m and parallel sides being 5 m and 10 m. What is the cost of painting the wall, if the rate of painting is Rs. 50 per square meter ?
1768 05ef055a07cd71c7944696a50
5ef055a07cd71c7944696a50- 1Rs.5000false
- 2Rs.3000true
- 3Rs.6000false
- 4Rs .4000false
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