Asked by rian

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
Answered by Ms. Sue
4/170 = 5/x

Cross multiply and solve for x.

Answered by rian
I got 850/x and 4 /x what do I do next to get the answer
Answered by Ms. Sue
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.

Answered by rian
thx u
Answered by Ms. Sue
You're welcome.
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