ratio/proportions

posted by .

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 -

    4/170 = 5/x

    Cross multiply and solve for x.

  • ratio/proportions -

    I got 850/x and 4 /x what do I do next to get the answer

  • ratio/proportions -

    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 -

    thx u

  • ratio/proportions -

    You're welcome.

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. Earth Science

    Which particles can wind move most easily?
  2. Math Pre Algebra

    Find the simple interest. $900 deposited at an interest rate of 3% for 5 years. $1,348 deposited at an interest rate of 2.5% for 18 months.
  3. math

    I have been staring at this problem forever, and cant seem to dig it up in my book. Please help! Two competing bank are trying to attract customers. (a) Ally Bank has an account which earns 25% interest every 10 years. Assuming the …
  4. Math 8 - Qs. Check

    Ratio, Proportions, and Similarity Similar Figures The White House, built 1792, is the oldest federal building in Washington, D.C. The building has undergone extensive remodeling over the years. The main building is four stories high …
  5. chemistry

    A camper obtained a sample of water from a mountain stream for cooking, but the water appeared to be cloudy with silt. What would be the best method of separating the silt from the water?
  6. Science

    1. How does groundwater cause erosion and deposition?
  7. earth

    Which of the following illustrates the formation of a delta?
  8. damon i need your help again

    Julie deposited $300 into a simple interest savings account that earns 1.34%. If no money is added or withdrawn from the account, about how long will it take for the interest to equal the deposited amount?
  9. Business Math

    Lisa Richter deposited $5,000 at 4% compounded semiannually for three years. At the beginning of the fourth year, Lisa deposited $2,500. What would her balance be at the end of five years assuming she is still earning 4% compounded …
  10. math

    how much silt do you need to add to 4ft cube of soil with 10% silt in order to make a soil with 60% silt?

More Similar Questions