Respuesta :

Noel has 30 cupcakes once Celia gives her 21 more.

Answer:

30 cupcakes

If you do 9 + 21 it gives you 30.

Easier way to do it:

Transfer 1 cupcakes from 21 to make 20 and put the one cupcakes with 9 to make 10.

10 + 20 = 30