The average weight of 8 boys is increased by 1.5 kg when one of the boys, who weights 65 kg, is replaced by a new boy. The weight of the new boy is-

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The average weight of 8 boys is increased by 1.5 kg when one of the boys, who weights 65 kg, is replaced by a new boy. The weight of the new boy is-

A70 kg

B74 kg

C76 kg

D77 kg

rahul ? Jan 15 '2020 at 9:14

Correct answer is: 77 kg

Explanation:

Total weight increased = \(( 8 \times 1.5 )\text{ kg}\) = 12 kg.
Weight of new man = 65 + 12 = 77 kg

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4/5 of a certain number is 64.half of the number is?

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4/5 of a certain number is 64.half of the number is?

A40

B32

C80

D16

rahul ? Jan 15 '2020 at 9:12

Correct answer is: 40

Explanation:

Let the number be x

Therefore,
\(\frac{4x}{5} = 64\)
4x = 320
x = 80

Hence, \(\frac{1}{2} \)of the number = \(\frac{1}{2} \times 80 \)= 40

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A man covers half of his journey at 6 km/ hr and the remaining half at 3 km/ hr. His average speed is-

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A man covers half of his journey at 6 km/ hr and the remaining half at 3 km/ hr. His average speed is-

A4 km/ hr

B4.5 km/ hr

C9 km/ hr

D3 km/ hr

rakul ? Jan 15 '2020 at 11:6

Correct answer is: 4 km/ hr

Explanation:

\(\text {Average speed =}\frac{2xy}{x+y}\)

\(= \frac{2 \times 6 \times 3}{ 6+3}\)

\(= \frac{36}{9}\)

\(=4 \text{ kmph}\)

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5852-28*?-1653=1064​

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5852-28*?-1653=1064​

A9

B13

C15

D18 7

yusaf ? Jan 8 '2020 at 7:37

Correct answer is:13

Explanation:

It is given that 5852-28*? -1653 = 1064

we have to find ?

therefore \(5852\times \frac{?}{28} = 1653+1064 = 2717\)

\(⇒209×? = 2717\)

\(⇒ = \frac{2717}{209} = 13\)

∴? = 13

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A student was asked to divide a number by 3. But, instead of dividing it, he multiplied it by 3 and got 29.7. What was the correct answer?

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A student was asked to divide a number by 3. But, instead of dividing it, he multiplied it by 3 and got 29.7. What was the correct answer?

A3.3

B9.3

C9.8

D9.9

souvik001 ? Jan 15 '2020 at 11:11

Correct answer is: 3.3

Explanation:

Let the number be X

When multiplied by 3 gives = 29.7

So,

\(x \times 3 = 29.7\)

\(x = 9.9\)

NOW, THE STUDENT WAS ASKED TO DIVIDE THE NUMBER BY 3

SO THE CORRECT ANSWER IS = \(\frac{9.9}{3}\)

\(= 3.3\)

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The L.C.M. of 26, 56, 104 and 182 is-

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The L.C.M. of 26, 56, 104 and 182 is-

A456

B728

C748

D1274

prakash ? Jan 15 '2020 at 13:30

Correct answer is: 728

Explanation:

Prime factorization of 26 = 2 * 13

Prime factorization of 56 = 2 * 2 * 2 * 7

Prime factorization of 104 = 2 * 2 * 2 * 13

Prime factorization of 182 = 2 * 7 * 13

LCM(26,56,104,182) = 2 * 2 * 2 * 7 * 13

                                  = 728.

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The H.C.F. of 595 and 252 is-

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The H.C.F. of 595 and 252 is-

A1

B7

C11

D17

rohan ? Jan 15 '2020 at 13:32

Correct answer is: 7

Explanation:

Prime factorisation of 595 = 5 × 17 × 7

Prime factorisation of 252 = 2 × 2 × 3 × 3 × 7

Therefore,

HCF of 595 and 252 = 7

We know that,

One Number × Other Number = HCF × LCM

595 × 252 = 7 × LCM

LCM = 595 × 252/7

LCM = 21420

Hence,

LCM and HCF of 595 and 252 is 21420 and 7.

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