There are 21 wheels at the bike shop. The wheels will be used to build tricycles and bicycles. Some day, the owner would like to build unicycles , too. There will behalf as many tricycles as bicycles. How many of each type of bike will be built?

There are 3 tricycles and 9 bicycles.

Step-by-step explanation:

Since we have given that

Number of wheels at the bike shop = 21

Number of wheels bicycle has = 2

Number of wheels tricycle has = 3

Let the number of tricycle be 'x'.

Let the number of bicycle be '2x'.

According to question, we get that

So, Number of bicycle would be

Hence, there are 3 tricycles and 9 bicycles.

a=24; b=12

step-by-step explanation:

a/b=2: 1

a=2b

36/(1+2)=12

b=12

a=24

i believe the answer is c.