Answer:
225 chairs
Step-by-step explanation:
Let the number of chairs ordered that cost $20 each be x and the number of chairs that cost $40 each is y.
Total cost= 20x +40y
Given that the company bought $6000 worth of chairs,
20x +40y= 6000
Dividing both sides by 20:
x +2y= 300 ----- (1)
x= 2y -----(2)
Substitute (2) into (1):
2y +2y= 300
4y= 300
y= 300 ÷4
y= 75
Subst. y= 75 into (2):
x= 2(75)
x= 150
Total number of chairs ordered
= x +y
= 150 +75
= 225
