Question

I just need help on these last questions.

Answer 1

Answer:
24.
`(145)/(100)`=
`(B)/(11)` and the answer is 16 people

25. 80 people

26. Type AB

Explanation:

24. Putting 145 donors over 100% is equal to B over 11% because you are trying to find how many donors have type B blood out of 145. 100% is all the people who donated blood and 11% is how many people had type B blood.

`(145)/(100)`=
`(B)/(11)`

You can solve this as well by cross-multiplying.

Then, you get:

319=20x and divide by 20 on each side. (I simplified 145/100 to 29/20)

x=15.95 then you round to 16.

25. Add up the percentage of people who do not have type O blood.
40%+11%+4%=55%. Multiply 145x55%=79.75 (round up) about 80 people.

26. You can use common sense here. The smallest percentage definitely has less than 10 donors. But to prove it just multiply 145x4%=5.8 (rounds to 6). 10>6 so Type AB