Question 995372
12+15 = 27 pancakes total so far


Let x = number of banana pancakes


x banana pancakes out of 27+x total gives the probability x/(27+x)


we want this probability to be 1/10, so,


x/(27+x) = 1/10
10*x = 1*(27+x)
10x = x+27
10x - x = 27
9x = 27
x = 27/9
x = 3


You need 3 banana pancakes