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i have a problem with this assignment. please help


Ahmed Issah

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i tried working this and am getting negative answers and i doubt my answers because it not possible to get negative number of people. PLEASE HELP ME

QUESTION

A college doctor found out that 40 students have had food poisoning. He found out the following after interviewing them.

25, 27 and 30 took rice, beans and plantain respectively.

28 took rice or plantain but not beans

13 took rice and plantain

10 took rice but did not take beans and plantain

7 took beans and plantain but not rice

determine the number of students who

a. took none of the meal

b. took all the three meal

c. took only one meal

d. took more than one meal

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