math
posted by kristeen on .
what must be added to 6 3/5 to produce 3 5/6?

6 3 / 5 = 6 * 30 / 30 + 3 * 6 / 30 =
180 / 30 + 18 / 30 = 198 / 30
3 5 / 6 = 3 * 30 / 30 + 5 * 5 / 30 =
90 /30 + 25 / 30 = 115 / 30
6 3 / 5 + x = 3 5 / 6
198 / 30 + x = 115 / 30
x = 115 / 30  198 / 30
x = 83 / 30 
33/5 + x = 23/6
times 30
198 + 30x = 115
30x = 83
x = 83/30