algebra
posted by mili .
a basket of with 12 apples has a mass of 3105 grams. the same basket with 7 apples has a mass of 1,980 grams. each apple has the same mass. what is the mass of the basket?

each apple has a mass of (31051980)/5
figure that out, then
mass=number*eachapplemass + basket
so let the number of apples 7
then
1980=7*eachapplemass+basket.
solve for basket