15/240 = 0.0625
15
240
16
0.0667
256
If you have 240 in the bank and your lessons cost 15, you can afford to have 16 lessons. 240 divided by 15 = 16
15
240
1
0.0625
40 divided 240 = 0.16666666666666666
240 divided into the ratio 53 = 4.528301886792453