word problem?

Question

the cost, c, of buying t trees and b bushes together with delivery charge is c = 10t +6b +15 greg has £315 to spend and needs 35 bushes, how many trees can he buy?

Answer 1

C = 10t + 6b +15

 

$315 to spend, must buy 35 bushes, how many trees?

 

$315 = 10t + 6(35) + 15

 

$300 = 10t + 210

 

 $90 = 10t

 

     9 = t

 

He can buy 9 trees