Problema Solution
Mary has an antique marble collection containing 40 marbles. She has five more red marbles than blue and twice as many red as green marbles. Write a system of equations to find the number of each color of marble.
Answer provided by our tutors
We will assume that Mary has red, blue and green marbles only.
Let
x = the number of red marbles
y = the number of blue marbles
z = the number of green marbles
x + y + z = 40
x = y + 5
x = 2z
........
click here to see the system of equations solved for x, y and z
........
x = 18 red marbles
y = 13 blue marbles
z = 9 green marbles
Mary has 18 red, 13 blue and 9 green marbles.