Joe can buy a pair of canvas shoes for $7 or a pair of leather shoes for $35. At these prices, what is the ratio of the cost of 6 pairs of canvas shoes to the cost of 3 pairs of leather shoes?

A. 1/10

B. 1/5

C. 2/5

D. 2/15

E. 3/10

1 pair of canvas is $7, therefore

6 pairs of canvas will be $ 42. while

1 pair of leather shoe is $35, thus

3 pairs of leather shoes is $105

Hence the ratio of the cost of canvas shoes to that of leather shoe will be;

$42 : $105 (simplifying)

= 6 : 15

= 2: 5; therefore the ratio is 2/15