Question 70012

Let x=number of people who ate blueberries

I assume that when the friends started eating, the box was full (10/10)

Now we know the the number of people (x) multiplied by the amount they ate (1/10) of a box each subtracted from the full box (10/10) must equal the amount that's left (2/5).  So our equation to solve is:

First lets change everything to decimals to make it easier:
10/10=1
1/10=0.1
2/5=0.4

1-0.1x=0.4 subtract 1 from both sides

-0.1x=-1+0.4
-0.1x=-0.6  Multiply both sides by -10

x=6-------------number that were eating on the blueberries

1-6(1/10)=2/5 or 4/10
10/10-6/10=4/10
4/10=4/10


Hope this helps---ptaylor