n elevi
fotbal : 1/4·n rest = n - 1/4·n = 3/4·n
volei : 1/3·3/4·n =1/4·n rest = 3/4·n - 1/4·n = 1/2·n
sah : 3/4·1/2·n = 3/8·n rest 1/2·n - 3/8·n = 1/8·n = 15 n = 120
|----------------------------------------- n elevi-----------------------------------|
|-------fotbal---------|-------volei--------|-----------sah-----------|----inot----|
1/4 + 1/4 + 3/8 = 7/8 1- 7/8 = 1/8 1/8din n = 15 n = 8·15 = 120
