# Math

posted by .

John bought some stamps. He used 3/5 of then to mail letters. He had 12 stamps left. How many stamps did he use?

• Math -

So 2/5 of the stamps are left with 12 stamps. So there for 1/5 of the stamps is 6 stamps. Now just multiply 6*3 for the amount that he sent.

=18

## Similar Questions

A man went to a post office to buy stamps. He bought x, 50 cent stamps and y, 25 cent stamps for \$3.50. If he bought twice as many 50 cent stamps and half as many 25 cent stamps, the cost would be \$4.75. Evaluate x and y
2. ### algebra

An executive bought 300 stamps for \$73.80. The purchase included 15 cent stamps, 20 cent stamps, and 40 cent stamps. The number of 20 cent stamps is four times the number of 15 cent stamps. How many 40 cent stamps were purchased?
3. ### aig math

David has 120 stamps. He gave 36 stamps to Maria and some to Alice. After that he had 5/8 of the stamps left. How many stamps did he give to Alice?
4. ### Maths

Hi I have a maths problem I can't figure out please someone help. Zac had some 2c stamps and 5c stamps.he needed to put 30c on a postcard to mail it.what combinations of stamps could he use.
5. ### math

zac had some 2c stamps and some 5c stamps.He needed to put 30c on a postcard to mail it. What combinations of stamps could he use?

brendan has 75 stamps in his collection. he puts 8 stamps on each page in his album. how many more stamps does he need to fill 10 pages with no stamps left over
7. ### math

Sam had a total of 80 foreign stamps and local stamps combined. After giving away 1/3 of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the …
8. ### math

Sam had 80 foreign stamps and local stamps. After giving away13of his foreign stamps and 10 local stamps, he had an equal number of foreign stamps and local stamps left. How many local stamps did he have in the beginning?