Question
Archie has some pink and green balls. The total mass of all his balls is 210 g. He has 7 less pink balls than green balls. The average mass of the pink balls is 9 g. The average mass of the green balls is 12 g. How many balls does Archie have altogether?
3 m

Click button first when a symbol is required. X

Archie has some pink and green balls. The total mass of all his balls is 210 g. He has 7 less pink balls than green balls. The average mass of the pink balls is 9 g. The average mass of the green balls is 12 g. How many balls does Archie have altogether?