Question

If the exchange rate is 125 yen = $1, a bottle of rice wine that costs 2500 yen costs a. $20. b. $25. c. $22. d. None of the above is correct.,

Answer 1

a. $20

Step-by-step explanation:

If 125 yen = $1

2500 yen = $x

(Cross multiple the values of yens and dollars)

125x = 2500

(divide both sides with 125 to have only x)

x = 20

OR

If the question says 125 yen per 1 dollar...

Mathematically, => 125 yen / 1 $

And the question is to find rate of 2500 yen to x dollar => 2500 yen / x dollar. (x representing the unknown quantity we are to find).

since rate is constant/fixed, we can equate both rate

125 yen 2500 yen

125 yen 2500 yen ----------- = --------------- => 125 x X= 2500 x 1

125 yen 2500 yen ----------- = --------------- => 125 x X= 2500 x 1 1$ x$

125 yen 2500 yen ----------- = --------------- => 125 x X= 2500 x 1 1$ x$ 125X = 2500 => X = 20

therefore X $ = 20 $