A little boy went into a baker's' 'How much are those cakes? he asked 'Two for 25 rupees,' said the baker ' How much does one cost ?' asked the boy '13 rupees,' said the baker 'Then I'll take the other one for 12 rupees !' said the boy

Ok let me explain it to Marium and everyone else
The little boy goes to the baker
The boy asks the baker for the price of the cakes
The baker says it is for 25 rupees
The boy asks the baker the price of one cake
The baker says it is for 13 rupees
If you subtract 25 from 13 you get 12
So the boy says that I will take one cake for 12 rupees
hahahahaha

It mean that two cakes are for 25 RUP. he asked the shopkeeper if i will take one from this how much i hav to pay he said 13 & then the person said i vil take other piece & i vil pay 12 to you bcoz total is 25 rup. 13+12=25