Question

marla can exchange $200 for 300 swiss francs. at that rate, how many dollars would a 210-franc swiss watch cost?

Answer 1

$140

Explanation:

Use a proportion.

$200 is to 300 Swiss francs as x dollars is to 210 Swiss francs.

200/300 = x/210

2/3 = x/210

3x = 2 × 210

x = 2 × 70

x = 140

Answer: $140