What is the answer to 3(8-a)=12

a=4

Step-by-step explanation:

3(8-a)=12, first distribute 3

24-3a=12, subtract 24 from both sides

-3a=-12, divide by -3

a=4

Step-by-step explanation:

In No.1

First you find the total number of girls which is 56-20 =36 girls in total

So to get number of boys who watched tennis 20-13=7 boys watched tennis

To get number of girls who didnt watch you do 36-17=19 girls who watched

Then add o get the totals

No.2

First you get the total number of male 80-47=33 males

Next you find the number of females doing phyisics 33-19=14 females

Next you find the number of females doing chemistry by 47-(18 + 14)=15 females

To get the number of males diong chemistry 21-15=6 males

Number of males doing biology 33-(19+6)=8

Then find the remaining totals

2

No. 2 (b)

Because there is a high number of students doing physics and most of them are female