It takes valentina 16 days to build a chubby house. if she and peter work together, they can finish building a chubb house in 15 days. find the number of days, h, that it will take peter to build a chubby house by himself.

  240 days

Step-by-step explanation:

Valentina's rate of construction is 1/16 house per day. Peter's rate of construction is 1/h house per day. Their total rate of construction is 1/15 house per day:

  1/16 + 1/h = 1/15

  1/h = 1/15 -1/16 = 1/(15·16) = 1/240 . . . . subtract 1/16

  h = 240 . . . . . . . . . . multiply by 240h

It will take Peter 240 days to build a Chubby house by himself.

introduction, methodology, results, discussion

step-by-step explanation:

an observational study is one which consists of actual observation to record data and then analyse the data.

there are a number of factors that should be analyzed before starting an observational study.

the main four factors are:

i) introduction:   this should be analysed to check whether the purpose of the study is correctly established and the data recorded are appropriate for the study

methodology:   the method of collecting the data, such as whether randomly selected, and whether sample size matches with the population to be studied, whether questions asked are easy to answer by common men, etc.

results: then results such as summary of data with comments should be studied thoroughly

discussion:   the last is the discussion, this can be either by management people or persons who are all interested , etc.