Question

Bobby has a bag containing 2 sizes of marbles. The big ones weigh 10 g and the small ones weigh 2 g. If there are five times as many small ones as big ones and the bag weighs 300 g, how many big marbles does he have?

Answer 1

let small be s and big be b
s=5b
s(2)+b(10)=300
5b(2)+b(10)=300
10b+10b=300
20b=300
b=15
Big marbles are 15

Answer 2

ok thank you I know you are busy but could you help me with one other type of problem?

Answer 3

sure :)