Tom earns $30 a week mowing lawns. He spends one-tenth of his earnings on lunch and one-fifth of his earnings on music. He saves the rest. How many dollars does Tom save? Tell me how you found the answer.

Tom saves $21

Step-by-step explanation: The monthly earning has been given as $30. The spendings are expressed as fractions of the total earnings. The expenses are as follows;

Lunch = one tenth of the earnings

Lunch = 1/10 x 30

Lunch = 30/10

Lunch = 3

Also he spends the following on music

Music = one fifth of the earnings

Music = 1/5 x 30

Music = 30/5

Music = 6

So he spends a total of 3 plus 6 which equals 9 dollars out of his earnings. His savings becomes

Savings = 30 - 9

Savings = 21

Therefore his savings is $21

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.

answer   download the app called socratic on your phoner:

step-by-step explanation: