Posted by Tony on .
A box of chalk and 2 staplers cost $10. Three boxes of chalk and 2 staplers cost $18. Find the total cost of 1 box of chalk and 1 stapler.

math 
Kuai,
staples = s
chalk = c
c + 2s = 10
3c + 2s = 18
c2s = 10
3c + 2s = 18
2c = 8
c = 4
s = 3
c + s
4 + 3 = 7
The total cost $7.