Thursday

January 29, 2015

January 29, 2015

Posted by **Maddy** on Tuesday, August 13, 2013 at 5:51am.

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.

- Maths -
**Reiny**, Tuesday, August 13, 2013 at 7:54amAssuming we can pay using either all 2c or 5c stamps...

let's start with

0 2c ----> 6 5c

1 2c ----> leaves 28 c, can't be done with 5c's

..

5 2c ---> leaves 20 c, paid with 4 5c

..

10 2c ---> 2 5c

15 2c ---> 0 5c

so in the form (2c , 5c) we have

(0,6) , (5,4), (10,2), and (15,0)

**Answer this Question**

**Related Questions**

math - zac had some 2c stamps and some 5c stamps.He needed to put 30c on a ...

Maths Pri 5 - The number of S's stamps is 30% of D's stamps. The number of D's ...

math - Sam had a total of 80 foreign stamps and local stamps combined. After ...

maths - The number of Samad's stamps is 30% of Derrick's stamps. The number of ...

Math (hard) - Postcard stamps are 20 cents each, while letter stamps are 33 ...

aig math - David has 120 stamps. He gave 36 stamps to Maria and some to Alice. ...

algebra - An executive bought 300 stamps for $73.80. The purchase included 15 ...

Math - John bought some stamps. He used 3/5 of then to mail letters. He had 12 ...

math - B had 30% as many stamps as C. C had 125% as many stamps as D. If D gave ...

Algebra - a colection of stamps consist of 2 cent stamps, 8 cent stamps, and 14 ...