## Currencies

Money is exchanged from one currency into another in a certain ratio, called the exchange rate. The exchange rate of US dollars to British pounds is $1.6:£1. A British pound buys more than 1 US dollar – I suppose that means English people are better than Americans. To change any amount of dollars into pounds or vice versa, construct a table. To change$60 into pounds, construct the table below.

 $£ 1.6 1 60 x The columns or rows are in a certain ratio, so or hence so$60 buys £37.50.

To change £120 into dollars construct the table below.

 $£ 1.6 1 x 120 The columns or rows are in a certain ratio, so or hence so £120 buys$192.

Suppose there are three currencies – pounds £, dollars $and Roubles R. £1 buys$1.6 or R56. I guess that means British people are better than Americans but much better than Russians.

I want to change $140 into Roubles. The £:$:R ratio is 1:1.6:56. The above table becomes

 $R 1.6 56 140 x The columns or rows are in a certain ratio, so or hence so$140 buys R4900.

Money is exchanged from one currency into another in a certain ratio, called the exchange rate. The exchange rate of US dollars to British pounds is $1.6:£1. A British pound buys more than 1 US dollar – I suppose that means English people are better than Americans. To change any amount of dollars into pounds or vice versa, construct a table. To change$60 into pounds, construct the table below.

 $£ 1.6 1 60 x The columns or rows are in a certain ratio, so or hence so$60 buys £37.50.

To change £120 into dollars construct the table below.

 $£ 1.6 1 x 120 The columns or rows are in a certain ratio, so or hence so £120 buys$192.

Suppose there are three currencies – pounds £, dollars $and Roubles R. £1 buys$1.6 or R56. I guess that means British people are better than Americans but much better than Russians.

I want to change $140 into Roubles. The £:$:R ratio is 1:1.6:56. The above table becomes

 $R 1.6 56 140 x The columns or rows are in a certain ratio, so or hence so$140 buys R4900. 