Answer:
53
Step-by-step explanation:
You make formulas for it.
Y= yellow marble and r= red marbles
So we know y+r=65
and y=5+4r because there are 5 more (plus) and 4 times ( multiply) yellow marbles
so now we make y+r=65 to have r= so you subract to the y so you get r= 65-y
now you plug that into your other formula
y= 5+ 4(65-y)
distribute
y=5+ 260-4y
add common numbers
y=265-4y
add 4y from both sides
5y=265 ( it is 5y because there is already a 1y on that side and 1y+4y=5y
then divied both sides by 5 y=53
