Explanation:
(a) Let the original price of each 6-day ski pass be x. Then, the sale price of each pass is 0.85x = 272. Solving for x, we have:
0.85x = 272
x = 320
Therefore, the original price of each 6-day ski pass was $320.
(b) Two 3-day ski passes cost 2 x £110 = £220. Converting to US dollars using the exchange rate, we have:
£220 x 1.70 = $374
Therefore, Andrew would save:
$374 - $272 = $102
by buying one 6-day ski pass in the sale rather than two 3-day ski passes.