Question

Drew has 50 red,green,and blue marbles. he has six more red marbles than blue marbles and four fewer green marbles than blue marbles write and solve an equation to determine how many blue marbles drew has.

Answer 1

Red = r

Blue = b

Green = g

Step 1: Write as algebraic equations.

r = b + 6

g = b - 4

Step 2: Merge the two equations together to form one, by adding them together.

r + g = b + b + 6 - 4

Step 3: Simplify.

r + g = 2b + 2

Step 4: Make b the subject.

2b + 2 = r + g

2b = r + g - 2

b = 0.5(r + g - 2)

ANSWER

b = 0.5(r + g - 2)