Discussion

Explanation:

Consider the solution to first question of this set.
1 gold coin = 10 bronze coins and 
1 silver coin = 4 bronze coins.

Number of coins with tribeswoman = 2g + 3s + 10b

Total value of coins with tribeswoman in terms of bronze coins = 2 × 10b + 3 × 4b + 10b = 42b

Now, let us calculate the value of each of the options in terms of bronze coins.

Option (a): 1 × 10b + 5 × 4b + 15b = 45b

Option (b): 2 × 10b + 2 × 4b + 15b = 43b

Option (c): 3 × 10b + 2 × 4b + 4b = 42b

Option (d): 2 × 10b + 4 × 4b + 7b = 43b

Hence, she could’ve only bought dress 3.

Hence, option (c).

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