a man used $3 to pay for 16 postage stamps. x of them are 15 cents each and the rest are 20 cents each. a) Write down an equation in terms of x and find the val
Mathematics
kkdancer1511
Question
a man used $3 to pay for 16 postage stamps. x of them are 15 cents each and the rest are 20 cents each. a) Write down an equation in terms of x and find the value of x. b) is the man supposed to receive and change? If so, find the amount
1 Answer

1. User Answers texaschic101
Answer:
Stepbystep explanation:
x = 15 cent stamps
y = 20 cent stamps
I will be using these equations
x + y = 16
0.15x + 0.20y = 3
x = 16  y
0.15(16  y) + 0.20y = 3
2.40  0.15y + 0.20y = 3
0.15y + 0.20y = 3  2.40
0.05y = 0.60
y = 0.60/0.05
y = 12.......there were 12 twenty cent stamps
x + y = 16
x + 12 = 16
x = 16  12
x = 4.....there were 4 fifteen cent stamps
no change is received