Question

If the exchange rate is 5 Egyptian pounds per U.S. dollar, a watch that costs $25 US dollars costs a. 125 Egyptian pounds b. 50 Egyptian pounds c. 5 Egyptian pounds d. None of the above is correct.

Answer 1

A. 125 Egyptian pounds

Step-by-step explanation:

Let’s create a proportion using the following setup.

pounds/dollars=pounds/dollars

We know that 5 Egyptian pounds is equal to 1 dollar.

5 pounds/ 1 dollar= pounds/dollars

We don’t know how many pounds are in 25 dollars. We can say x pounds are in 25 dollars.

5 pounds / 1 dollar = x pounds/ 25 dollars

5/1=x/25

We want to find out what x is, so we need to get x by itself.

x is being divided by 25. The inverse of division is multiplication. Multiply both sides of the equation by 25.

25*(5/1)=(x/25)*25

25*5/1=x

25*5=x

125=x

$25 US dollars are equal to 125 Egyptian pounds. Therefore, the watch will cost 125 Egyptian pounds and choice A is correct.