Fred earns $ 40 mowing lawns he
spends $10 on mp3, puts half of
whats left in a saving account
and get another $5 for washing
- write the expression represents
the # of dollars fred keeps (and does
not put in saving account).

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.