John has us and foreign stamps in his album. the ratio of the numer of us stamps to foreign stamps is 5: 2. after paul gives him 12 foreign stamps the ratio becomes 2: 1. find the number of us stamps he has.

The number of U.S stamp he has is 120.

Step-by-step explanation:

John has us and foreign stamps in his album. the ratio of the number of U.S stamps to foreign stamps is 5:2.

After Paul gives him 12 foreign stamps the ratio becomes 2:1.

Now, to find the number of U.S stamps.

Let the U.S stamps be

And the foreign stamps be

Now, to solve by using cross multiplication method:

So, the ratio is:

By cross multiplying we get:

Dividing both sides by 2 we get:

......(1)

Now, after Paul gives him 12 foreign stamps the ratio becomes:

By cross multiplying we get:

Putting the value of as we get in above equation (1):

Multiplying both sides by 2 we get:

Subtracting both sides by 4y we get:

The number of foreign stamps = 48.

Now, to get the number of U.S stamps by putting the value of in equation (1):

Therefore, the number of U.S stamp he has is 120.

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