Posted by **rian** on Wednesday, November 13, 2013 at 7:03pm.

a geologist found that silt was deposited on a river bed at the rate of 4cm every 170 years , how long would it take for 5 cm of silt how long would it to be deposited ???? plz helpp

- ratio/proportions -
**Ms. Sue**, Wednesday, November 13, 2013 at 7:10pm
4/170 = 5/x

Cross multiply and solve for x.

- ratio/proportions -
**rian**, Wednesday, November 13, 2013 at 7:14pm
I got 850/x and 4 /x what do I do next to get the answer

- ratio/proportions -
**Ms. Sue**, Wednesday, November 13, 2013 at 7:18pm
When we cross multiply, we multiply the first and last terms together. Then we multiply the two middle terms together.

4/170 = 5/x

4x = 850

Divide both sides by 4

x = 212.5 years

It'll take 212.5 years for 5 cm of silt to be deposited.

- ratio/proportions -
**rian**, Wednesday, November 13, 2013 at 7:30pm
thx u

- ratio/proportions -
**Ms. Sue**, Wednesday, November 13, 2013 at 7:34pm
You're welcome.

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