Question

To buy both green and blue bikes would cost $1500. To buy the green and red bikes would cost $750. To buy al three bikes would cost $2000. How much does each bike cost?

Answer 1

Let cost of green bike be G, blue bike be B and red bike be R

G+B = 1500 ---(1)
G+ R= 750 ---(2)
G+B+R = 2000. --(3)

Take (3) minus (1)

G+B+R - (G+B) = 2000-1500
R= 500

since R= 500, from (2)
G+R= 750
G+ 500= 750
G= 250

Since G= 250, from (1)
G+B = 1500
250 +B = 1500
B= 1250

Answer 2

red:500
green:250
blue:1250

Answer 3

Let B = Blue, R, Red, and G, Green

B = 1250
R = 500
G = 250

G + B = 1500
G + R = 750
G + R + B = 2000

750 + B = 2000
B = 1250

G + 1250 = 1500
G = 250

250 + R = 750
R = 500