Question

Which ratio is NOT equivalent to 10:20?

1:2
50:100
40:70
30:60

Answer 1

40 : 70 is not equivalent

Explanation:

If a ratio is a multiple or divisor of its parts then it is equivalent

10 : 20 ( divide both parts by 10 )

= 1 : 2 ← equivalent ratio

10 : 20 ( multiply both parts by 5 )

50 : 100 ← equivalent ratio

10 : 20 ( multiply both parts by 3 )

30 : 60 ← equivalent ratio

10 : 20

We cannot multiply the parts by a common multiple to obtain 40 : 70

40 : 70 is not an equivalent ratio