Question

When 3/8 part of a number added in any number. then what will be the ratio of prime and new number?​

Answer 1

Answer:

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kinetic energy of an object of mass, m moving with a velocity of 5 ms 1 is 25 What will be its kinetic energy when its velocity is doubled? What will be its kine energy when its velocity is increased three times.

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please give correct answers

Step-by-step explanation:

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kinetic energy of an object of mass, m moving with a velocity of 5 ms 1 is 25 What will be its kinetic energy when its velocity is doubled? What will be its kine energy when its velocity is increased three times.

______________________

please give correct answers

Answer 2

Answer:

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Questions & Answers

CBSE

Mathematics

Grade 8

Ratio and Proportions

Question

Answers

Related Questions

What number should be added to each of these numbers 12, 22, 42 and 72 so that the resulting numbers may be in proportion?

Answer

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Hint: Product of extremes is equal to the product of mean. Proportional numbers are represented as a:b::c:d

, where a,d

are the extremes and b,c

are known as the mean. In this question four proportional numbers are given so first we will add a common unknown number to them and then we will use means and extremes property to find the unknown number.

Complete step-by-step answer:

Given the four proportional numbers 12:22::42:72

Let x

be the number added to each of these numbers, so the new numbers become

First number =12+x

Second number =22+x

Third number =42+x

Fourth number =72+x

Now after adding an unknown numbers, since the resulting numbers need to be in proportion so we can write these numbers as

12+x:22+x::42+x:72+x

Now we know the means and extremes property of proportionality where the product of extremes is equal to the product of mean, hence we can write

(12+x)×(72+x)=(22+x)×(42+x)

Now by solving this

⇒12×72+12x+72x+x2=22×42+22x+42x+x2⇒864+84x=924+64x⇒84x−64x=924−864⇒20x=60⇒x=3

Therefore we get the value of x=3

Hence we can say if we add 3 to the numbers 12, 22, 42 and 72 the resulting numbers will be in proportion.

The resulting numbers