Answer:

1/5

Step-by-step explanation:

5 1/15x1/?=1

75/15x1/?=75/15(the mixed number make it an improper fraction and it will become 75/15 and then multiply it by 1)

75/15=75÷15=5(divide it)

5[is the missing denominator(?)]

Answer:

1/3

Step-by-step explanation:

5 1/15 is equivalent to 1/3

so,

1/3*1/x=1

multiply 3 on both sides

3*1/3*1/x=1*3

1/x=3

then, cross multiply

3x=1

x=1/3