Question 1063706
 Sam makes some bread rolls. He gives 2/5 of the bread rolls to his neighbor and 4/9 of the remainder to his cousin.
 He has 15 bread rolls left.
 How many bread rolls does Sam make?
let b = total number of bread rolls made
The remainder is 3/5
b = {{{2/5}}}b + {{{4/9}}}*{{{3/5}}}b + 15
b = {{{2/5}}}b + {{{12/45}}}b + 15
multiply by 45 to get rid of the fractions
45b = 9(2b) + 12b + 45(15)
45b = 18b + 12b + 675
45b = 30b + 675
45b - 30b = 675
15b = 675
b = 675/15
b = 45 rolls total