Number System
- A number when divided by 3 leaves a remainder 1. When the quotient is divided by 2, it leaves a remainder 1. What will be the remainder when the number is divided by 6?
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The least number (dividend) x is obtained as follows :
Correct Option: B
The least number (dividend) x is obtained as follows :
y = 2 × 1 + 1 = 3
x = 3 × 3 + 1 = 10
When we divide 10 by 6, the remainder = 4
- The sum of first sixty numbers from one to sixty is divisible by
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As we know that ,
Sum of first n numbers = n (n + 1) 2
Correct Option: D
As we know that ,
Sum of first n numbers = n (n + 1) 2 Sum of first 60 numbers = 60 (60 + 1) = 60 × 61 = 1830 2 2
The number 1830 is divisible by 61.
- How many natural numbers divisible by 7 are there between 3 and 200 ?
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Number just greater than 3 which is divisible by 7 = 7
Number just smaller than 200
which is divisible by 7 = 196
Here, a = 7, an = 196,
d = 7, n = 8Correct Option: B
Number just greater than 3 which is divisible by 7 = 7
Number just smaller than 200
which is divisible by 7 = 196
Here, a = 7, an = 196,
d = 7, n = 8
∴ an = a + (n –1)d
⇒ 196 = 7 + (n – 1) × 7⇒ n − 1 = 196 − 7 = 27 7
⇒ n = 27 + 1 = 28
2nd method to solve this question
We can find the answer after dividing 200 by 7.
The quotient is our answer.
- Each member of a picnic party contributed twice as many rupees as the total number of members and the total collection was 3042. The number of members present in the party was
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Let the required number of persons be N.
According to the question,
2N2 = 3042Correct Option: A
Let the required number of persons be N.
According to the question,
2N2 = 3042⇒ N2 = 3042 = 1521 2
⇒ N = √1521 = 39
- In a division problem, the divisor is 4 times the quotient and 3 times the remainder. If remainder is 4, the dividend is
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Given , Remainder = 4
According to question ,
Divisor = 3 × Remainder
⇒ Divisor = 3 × 4 = 12
Again, divisor = 4 × quotient
⇒ 4 × quotient = 12Correct Option: B
Given , Remainder = 4
According to question ,
Divisor = 3 × Remainder
⇒ Divisor = 3 × 4 = 12
Again, divisor = 4 × quotient
⇒ 4 × quotient = 12⇒ Quotient = 12 = 3 4
⇒ Dividend = 3 × 12 + 4 = 40