Question

Which of the following ratio is not equivalent to 10:5
1:2
2:1
20:10
30:15

Answer 1

Answer:

1:2

because 10:5=2:1

2:1=2:1

20:10=2:1

30:15=2:1

Answer 2

Answer:

1:2

Explanation:

Because,

10:5 = 2:1

20:10 = 10×2:5×2

= 10:5

= 2:1

30:15 = 10×3:5×3

= 10:5

= 2:1