In the picture you will see the cars or VW Beetles in different colors representing certain numbers. Can you solve the equations and find the value of the missing number?

Check answer bellow:

Let us represent the cars with letters to make it easy to solve.

Let’s us assume the following;

B = Blue car

R = Red Car &

G = Green car.

So we can convert the equations as;

B + B + B = 18 —-(1)

R + R + R = 9 —-(2)

G x G – G = 6 —-(3)

B X R – G = ? —-(4)

From (1)

B + B + B = 18

3B = 18

Therefore;

B = 6

From (2)

R + R + R = 9

3R = 9

Therefore;

R = 3

From (3)

In case of (3) you can use the trial and error method to get the value of G;

I could figure out 2 numbers that can take the value of G in the equation.

G can be 3 or -2

So let’s put both the values in the equation (4) and find the value of the missing number.

B X R – G = ?

6 X 3 – 3 = 18 – 3 = 15

&

6 x 3 -(-2) = 18 + 2 = 20

So the 2 possible answers are 15, 20.