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
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.
