Correct Answer: ans: 3:2

Explanation:

Since the man buys maximum number of shirts, so the following calculation may follows:

If maximum no. of shirts is 12, total cost =12 x 70 = 840 which greater than given total 810

If maximum no. of shirts is 11, total cost =11 x 70 = 770 and cost of ties = 810 — 770 = 40

If maximum no. of shirts is 10, total cost = 10 x 70 = 700 and cost of ties = 810 — 700 = 110

If maximum no. of shirts is 9, total cost = 9 x 70 = 630 and cost of ties = 810 — 630 = 180

Here 40 and 140 is not divisible by 30, so these two is not possible.

But, 180 is divisible by 3so number of ties = 180 + 30 = 6

Ratio of shirts to ties = 9 : 6 = 3 : 2