Which ratio is equivalent to 3/7? a) 6 to 10 b) 9: 12 c) 12/35 d) 7 to 3

we are ratio as

It will be equivalent to only those terms which would be multiple of this term

so, we will multiply top and bottom term by 5

and we get

so, it is very similar to 12/35

so, it will be equivalent to 12/35

so, option-C.......Answer

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.