SOLUTION: Problem: There are some boys and dogs at a place. If total number of heads is 7 and total number of legs is 20, how many boys and how many dogs are there? please solve this que

Algebra ->  Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: Problem: There are some boys and dogs at a place. If total number of heads is 7 and total number of legs is 20, how many boys and how many dogs are there? please solve this que      Log On


   

Question 977689: Problem: There are some boys and dogs at a place. If total number of heads is 7 and total number of legs is 20, how many boys and how many dogs are there?
please solve this question.
Answer by richwmiller(17219) About Me  (Show Source):
You can put this solution on YOUR website!
b+d=7
4d+2b=20
b=7-d
4d+2(7-d)=20
4d+14-2d=20
2d=6
d=3
b=4
check
4*2+3*4=20
8+12=20
ok