1. ## fractions

As a result of the 1998 tsunami in Northern New Guinea, 2200 people were killed. This represented 3/7 of the total number of people killed by tsunamis between January 1990 and January 2000. How many people were killed by tsunamis between 1990 and January 2000 (answer correct to 2 decimal places)

Thanks, Chhoeuk

2. Originally Posted by chhoeuk
As a result of the 1998 tsunami in Northern New Guinea, 2200 people were killed. This represented 3/7 of the total number of people killed by tsunamis between January 1990 and January 2000. How many people were killed by tsunamis between 1990 and January 2000 (answer correct to 2 decimal places)

Thanks, Chhoeuk
Let x be the number of people killed by tsunamis between Jan 1990 and Jan 2000.

2200 = (3/7)x
=>x = (7/3)2200
=> x = 5133.33 people

3. ## tsunami

Originally Posted by chhoeuk
As a result of the 1998 tsunami in Northern New Guinea, 2200 people were killed. This represented 3/7 of the total number of people killed by tsunamis between January 1990 and January 2000. How many people were killed by tsunamis between 1990 and January 2000 (answer correct to 2 decimal places)

Thanks, Chhoeuk
In case you're not using algebra yet, you can do this with proportions:

2200 = 3/7 Divide both sides by 3 -- carry the result to 3 decimal places, so that at the end you can round off to 2 places.

2200/3 = 1/7

Now multiply both sides by 7 to get the whole (7/7 = 1)

Round to 2 decimal places to finish.