Answer:
There are 62 white marbles.
Step-by-step explanation:
<u>Important information:</u>
<em>The number of white marbles is 2 less than 4 times the number of yellow marbles. 78 marbles in total.</em>
<u>Declare your variables:</u>
Let w represent the number of white marbles.
Let y represent the number of yellow marbles.
<u>Create your equations:</u>
We know,
w = 4y - 2 (2 less than 4 times yellow)
w + y = 78 (total 78 marbles)
<u>Solve:</u>
We have an equation for w, so insert that into the second equation,
4y - 2 = 78
4y = 80
y = 16
Now we know the value of y, so insert that into the first equation,
w = 4(16) - 2
w = 64 - 2
w = 62