Answe:
one bag contains 3 cubes
Step-by-step explanation:
we have two kind of objects
bags and cubes
so we can set up
[tex]1bag=x\\\\1cube=y[/tex]
so in the left side we have
2 bags and 7 cubes
[tex]=2x+7y[/tex]
in the right side we have
1 bag and 10 cubes
[tex]=x+10y[/tex]
and the both sides are equal so we have
[tex]2x+7y=x+10y[/tex]
we need to solve for x
[tex]2x+7y-x=x-x+10y\\\\x+7y=10y\\\\x+7y-7y=10y-7y\\\\x=3y[/tex]
so one bag has 3 cubes
