Question

Barbara has prepared 120 pastries for a dinner with friends. knowing that 12/20 have been consumed as many as they have been? [48]

I need the procedure, please

Answer 1

120 are prepared,
12 out of 20 are consumed so
8 out of 20 are not consumed.

If we brake 120 in groups of 20 we get 120/20= 6 groups

12•6= 60+12= 72 are consumed;
8•6 = 48 are not consumed.

Answer 2

I don't quite understand what your question is.