himba

apple(0.7)	banana(0.5)		banana(0.5)Apple
1x0.7	5.6/0.5=I , no		1x0.5	5.8/0.7, no
2x0.7	4.9/0.5=I, no		2x0.5	5.3/0.7, no
3x0.7	4.2/0.5, no		3x0.5	4.8/0.7, no
4x0.7	3.5/0.5, yes		4x0.5	4.3/0.7, no
5x0.7	2.8/0.5, no		5x0.5	3.8/0.7, no
6x0.7	2.1/0.5, no		6x0.5	3.3/0.7, no
7x0.7	1.4/0.5, no		7x0.5	2.8/0.7, yes
8x0.7	0.7/0.5, no		8x0.5	2.3/0.7, no
9x0.7	yes,		9x0.5	1.8/0.7,no
			10x0.5	1.3/0.7, no
			11x0.5	0.8/0.7, no

So, 11 is the only possible answer.