Number System
- Which of the following fractions does not lie between
5 and 8 ? 6 15
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5 = 0.83 6 8 = 0.53 15 6 = 0.86 7
Clearly, 0.53 < 0.83 < 0.86Correct Option: D
5 = 0.83 6 8 = 0.53 15 6 = 0.86 7
Clearly, 0.53 < 0.83 < 0.86
- The smallest fraction, which should be added to the sum of
2 1 , 3 1 , 4 1 , and 5 1 2 3 4 5
to make the result a whole number, is
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2 1 + 3 1 + 4 1 + 5 1 2 3 4 5 = (2 + 3 + 4 + 5) + 1 + 1 + 1 + 1 2 3 4 5 = 14 + 30 + 20 + 15 + 12 60 = 14 + 77 = 14 + 1 17 60 60 = 15 77 60 ∴ Required answer = 1 – 77 = 60 − 17 = 43 60 60 60 Correct Option: D
2 1 + 3 1 + 4 1 + 5 1 2 3 4 5 = (2 + 3 + 4 + 5) + 1 + 1 + 1 + 1 2 3 4 5 = 14 + 30 + 20 + 15 + 12 60 = 14 + 77 = 14 + 1 17 60 60 = 15 77 60 ∴ Required answer = 1 – 77 = 60 − 17 = 43 60 60 60
- The vulgar fraction of 0.3939 is :
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0.3939 = 0.39
= 39 = 13 99 33 Correct Option: D
0.3939 = 0.39
= 39 = 13 99 33
- If 3/4 of a number is 7 more than 1/6 of the number, then 5/3 of the number is :
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Let the number be x.
According to the question,3x − x = 7 4 6 ⇒ 9x − 2x = 7 12
⇒ 7x = 12 × 7⇒ x = 12 × 7 = 12 12 ∴ 5x = 5 × 12 = 20 3 3 Correct Option: B
Let the number be x.
According to the question,3x − x = 7 4 6 ⇒ 9x − 2x = 7 12
⇒ 7x = 12 × 7⇒ x = 12 × 7 = 12 12 ∴ 5x = 5 × 12 = 20 3 3
- If the sum of two numbers, one of which is 2/5 times the other, is 50, then the numbers are
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First number = x (let)
∴ Second number = 2x 5 ∴ x + 2x = 50 5 ⇒ 5x + 2x = 50 5
⇒ 5x + 2x = 50 × 5
⇒ 7x = 250⇒ x = 250 7 ∴ Second number = 2 × 250 = 100 5 7 7
Correct Option: D
First number = x (let)
∴ Second number = 2x 5 ∴ x + 2x = 50 5 ⇒ 5x + 2x = 50 5
⇒ 5x + 2x = 50 × 5
⇒ 7x = 250⇒ x = 250 7 ∴ Second number = 2 × 250 = 100 5 7 7