A bike shop sells rolling strollers for runners with babies, with a total of 28 in the store. Some of the strollers have 3 wheels and some have 4. If there are 100 wheels, how many 3-wheel strollers are there?

A.
25
B.
12
C.
3
D.
16

Question

A bike shop sells rolling strollers for runners with babies, with a total of 28 in the store. Some of the strollers have 3 wheels and some have 4. If there are 100 wheels, how many 3-wheel strollers are there?


A.
25
B.
12
C.
3
D.
16

anonymous · Answer

let x = number of 3 wheel stollers
let y = number of 4 wheel strollers

x + y = 28
y = 28 - x

3x + 4y = 100
3x + 4(28 - x) = 100
3x + 112 - 4x = 100
-x = -12
x = 12

B) there are 12, three wheel strollers