At a telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds. If they ring together at 11 : 25 a.m. When will they next ring together?

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At a telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds. If they ring together at 11 : 25 a.m. When will they next ring together?

A11 : 29 a.m.

B11 : 27 a.m.

C11 : 51 a.m.

D12 : 29 p.m.

rahul ? Jan 14 '2020 at 9:33

Correct answer is: 11:27 a.m.

Explanation:

Time taken by three phones to ring together = LCM of 20, 24 and 30

⇒ Time taken by three phones to ring together = 120 seconds

(? 1 min = 60 seconds)

⇒ Time taken by three phones to ring together = \(\frac{120}{60} = 2 \text{ min}\)

If the three phones ring together at 11:25 am then they will next ring together after 2 minutes i.e. at 11:27 am.

∴ Time at which the phones next ring together = 11:27 am

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Din-i-Ilahi was promoted by .......

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Din-i-Ilahi was promoted by .......

ABabar

BBahadur Shah

CAkbar

DHumayun

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Who amongst the following was a pioneering psychologist?

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Who amongst the following was a pioneering psychologist?

ASocrates

BNeils Bohr

CSigmund Freud

DIsaac Newton

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If x is a prime number, LCM of x and its successive number would be ......

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If x is a prime number, LCM of x and its successive number would be ......

Ax

BX + 1

Cx (x + 1)

Dx/(x+1)

rahul ? Jan 14 '2020 at 9:36

Correct anwer is: x (x + 1)

Explanation:

We know that,

2, 3, 5, 7……. are prime numbers.

Let us solve this question by substituting the above prime numbers.

If x = 2 then (x + 1) = 3

⇒ LCM of 2 and 3 = 2× 3 = x × (x + 1) = 6

If x = 3 then (x + 1) = 4

⇒ LCM of 3 and 4 = 3 × 4 = x × (x + 1) = 12

∴ If x is a prime number, LCM of x and its successive number = x(x + 1)

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The perimeter of a triangle is 28 cm. If the length is 5/2 times its breadth, find the length and breadth of the triangle.

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The perimeter of a Rectangle is 28 cm. If the length is 5/2 times its breadth, find the length and breadth of the rectangle.

A9 & 5

B10 & 4

C6 & 7

D11 & 3

rahul ? Jan 14 '2020 at 10:50

Correct Answer is: 10 & 4

Explanation:

Sides 5x and 2x

Perimeter of rectangle = 2 ( Length + Breadth)

Perimeter = 2(5x+2x) =28

x=2

Sides =10 and 4

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Which of the following is the currency of Thailand?

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Which of the following is the currency of Thailand?

ARupee

BDollar

CBaht

DYuan

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The ratio between the weights of gold and silver in an alloy is 17 : 3. If the weight of silver in the alloy is 2.7 gm, find the weight of gold in the alloy.

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The ratio between the weights of gold and silver in an alloy is 17 : 3. If the weight of silver in the alloy is 2.7 gm, find the weight of gold in the alloy.

A12.6 gm

B15.3 gm

C18 gm

D21.2 gm

rahul ? Jan 14 '2020 at 10:51

Correct answer is: 15.3 gm

Explanation:

Let the weights of gold and silver in an alloy be 17x and 3x respectively

Weight of silver in the alloy = 2.7 gm

⇒ 3x = 2.7

⇒ x = 0.9 gm

Weight of gold in the alloy = 17× 0.9 = 15.3 gm

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