38)
a math teacher wants to make a test containing 50 easy questions and 20 hard questions. each easy question is allowed 30
seconds and each hard question is allowed 1 minute 30 seconds to complete. how many minutes should the teacher allow for the
whole test?

Maximum time the teacher should allow for the whole test should be = 55 minutes

Step-by-step explanation:

Number of easy questions in the test = 50

Number of hard questions in the test = 20

Time for each easy question = 30 seconds =    

[As 1 minute = 60 seconds]

Time for each hard question = 1 minute 30 seconds =

Using unitary method to find duration of whole test.

If 1 easy question takes = 0.5 minutes

Then, 50 easy questions will take = = 25 minutes

If 1 hard question takes = 1.5 minutes

Then, 20 hard questions will take = = 30 minutes

Total time for the test will be = = 55 minutes

phosphate, calcium ion, chloride ion, neon atom

step-by-step explanation:

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.