Question

a survey asked a group of adults and youths if they prefer reading books printed on paper or electronic books. results are shown in the table below, but some values are missing. fill in the missing values.

book preference

	print	electronic	total
adults		29
total	66

Explanation:

Step1: Calculate the total for youths

To find the total number of youths, add the number of youths who prefer print books ($29$) and the number of youths who prefer electronic books ($26$).
$$29 + 26=55$$

Step2: Calculate the number of adults who prefer print books

Since the total number of people who prefer print books is $66$ and the number of youths who prefer print books is $29$, subtract the number of youths who prefer print books from the total number of people who prefer print books.
$$66 - 29 = 37$$

Step3: Calculate the total number of adults

Let the number of adults who prefer print books be $37$ and the number of adults who prefer electronic books be $29$. Then the total number of adults is $37+29 = 66$

Step4: Calculate the total number of people who prefer electronic books

The number of youths who prefer electronic books is $26$ and the number of adults who prefer electronic books is $29$. So the total number of people who prefer electronic books is $26 + 29=55$

Step5: Calculate the grand - total

The total number of youths is $55$ and the total number of adults is $66$. So the grand - total is $55+66 = 121$

Answer:

	Print	Electronic	Total
Adults	$37$	$29$	$66$
Total	$66$	$55$	$121$