Saturday

October 25, 2014

October 25, 2014

Posted by **Katherine** on Monday, April 4, 2011 at 6:34pm.

(A) How many postcards did Zachary have in the beginning?

(B) How many postcards did Zachary give to John?

- math !!!! :O -
**Reiny**, Monday, April 4, 2011 at 7:20pmThe way you define your variables is very crucial

let the number of cards John has be 4x

let the number of cards Zach has be 9x

(notice 4x : 9x = 4:9 )

Zach has 45 more than John

so 9x = 4x + 45

5x = 45

x = 9

so now we know that John has 36 and Zach has 81

so after the "give-away"

John has 36+y

Zach has 81-y

we are told that now Zach has 6/7 as many as John

81-y = (6/7)(36+y)

567 - 7y = 216 + 6y

-13y = -351

y = 27

**Answer this Question**

**Related Questions**

math - The ratio of the number of postcards john had to the number of postcards ...

math - The ratio of the number of postcards john had to the number of postcards...

Pre-Algreba - The ratio of the number of postcards john had to the number of ...

math - The ratio of the number of postcards john had to the number of postcards ...

math word problems - Sally and marta had the same number of postcards. After ...

math - Sally and Marta had the same number of postcards. After Sally sold 18 of ...

math - There are 10 boxes of postcards. Each box contains 10 bundles of 10 ...

English - 1. What is the opposite of "upside down"? 2. Don't tell me, because I ...

math - Lena bought a total of 20 postcards. She bought 6 more large poscards ...

Math - Sally and Marta have the same number of postcards