On a certain day, the exchange rate was 60 u. s. dollars for 50 euro. how many u. s. dollars were 70 euro worth that day? show that your answer is reasonable.

The exchange rate is 60:50 (us:euro)

if you have 70 euros, then x:70

60(x) : 70(50)

60x /60 : 3500/60

x = 58.33

seventy euro dollars = $ 58.33 on that particular day

hope this helps

60 / 50 = x / 7060 U.S. to 50 euro = x U.S to 70 euro
cross multiply because this is a proportion
(50)(x) = (70)(60)
50x = 4200
x = 4200/50
x = 84 <== so 84 U.S dollars = 70 euros

proportions are nothing but equivalent fractions..
60/50 = 1.2
84/70 = 1.2
and as u can see, these are equivalentso this is reasonable

The answer is