Today I Learnt

Today I Learnt.

Today I had a work shop with Mr Corlett and I learnt somethings about fractions here is what I learnt.
Okay  here is what I learnt, there are 15 candles left on a 3/4 of a cake how many candles were on the whole cake?
Anwser: 20
I also learnt that 3/4 0f 20 is 15 and 2/3 of 9 is 6.