Which ratio is equivalent to 3:18?
A 6:21
B 5:20
( 7:42
D 12:2

Answer is C. 7:42
Because the numbers from the ratio 3:18 , 18/3 is 6
And from the ratio 7:42, 42/7 is also 6
Because the difference in the ratios are the same, the ratios are equivalent

Another way is that 3:18 can be rewritten as 3/18 which is simplified to 1/6. 7:42 = 7/42 which also equals 1/6.

Both ratios simplified equal 1:6.
None of the other answers simplify to this but C.

Pls Mark Brainliest and have a nice day

C 7:42 you just calculate the ratio of an amount then divide by the total number of parts in. The ratio and then multiply this answer by the original ratio

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