Question

Which of the following ratios is not equivalent to the ratio 5/6   Explain

10/12, 13/14, 15/18, 25/30

Answer 1

10/12=5/6 (Divide numerator and denominator by 2)

13/14=13/14 (Not equivalent to the ratio 5/6)

15/18=5/6 (Divide numerator and denominator by 3)

25/30=5/6 (Divide numerator and denominator by 5)

Answer 2

10/12 = 2*5 / 2*6 = 5/6
15/18 = 3*5 /3*6 = 5/6
25/30 = 5*5 /5*6 = 5/6

But what's the 13/14 :(. You can't simplify it to 5/6 or something else.