Abike 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

Option: B is the correct answer.

                        B.  12

Let the number of 3 wheel strollers be: x

and the number of 4 wheel strollers be: y

Now  we are given that:

There are a total of 28 strollers in the store.

That means:

                 x+y=28(1)

and also, the total number of wheels are: 100

This means that:

            3x+4y=100(2)

Using equation (1) we have:  y=28-x

On putting the value of y in equation (2) we get:

3x+4(28-x)=100

⇒  3x+112-4x=100

⇒  -x+112=100

⇒  x=112-100

⇒  x=12

         Hence, the number of 3-wheel strollers are:

                                  12

70,000 + 6,000 + 800 + 30

step-by-step explanation: