Tanya has 4 red marbles, 7 blue marbles, and 8 green marbles. Which expression can be used to find the percent of Tanya's marbles that are blue?
7/(4+7+8) = 7/19
To find the percent of Tanya's marbles that are blue, we need to divide the number of blue marbles by the total number of marbles and then multiply by 100.
Let's define:
R = Number of red marbles
B = Number of blue marbles
G = Number of green marbles
In this case, R = 4, B = 7 and G = 8.
The total number of marbles Tanya has is given by (R + B + G).
So, the expression to find the percent of Tanya's marbles that are blue is:
(B / (R + B + G)) * 100
Now, plug in the given values:
(7 / (4 + 7 + 8)) * 100
Simplifying the expression:
(7 / 19) * 100
The percent of Tanya's marbles that are blue is approximately 36.84%.