Funadvice Logo
Explore Join
More Education & School Questions

What is the answer to this scientifical math problem?

I’m having problem figuring this question out: Assume the brain is 70% water. If the average adult human brain weighs 1.4 kg, how many kilograms of water does it contain? Thank you for any help.

Become an Expert →
Answer #1

density of water is 1g/m^3

so, 75/1001.4kg x 1m^3/gram 1000gram /kg = 980 grams. (use conversion factors, they are really the easiest)

Answer #2

.98 but I’m sure you figured that out already :P

Answer #3

1.4 x 0.7 = 0.98 kg

to figure this out

100% of the brain = 1.4 70% of the brain = x

cross multiply

100% of the brain multiplied by x = 1.4 x 70% of the brain

100% = 100/100 = 1 70% = 70/100 = 0.7

1x = 1.4 x 0.7 x = 0.98

Answer #4

To figure it out simply multiply 1.4 by .7 and you will get the percentage made up by water.

Answer #5

Thanks for the correction, wasn’t thinking to well since I did something entirely different to find the answer lol.

Answer #6

yep but shouldnt the 70 be multiplied?

Answer #7

Your answer is 980 grams of water or .98 kilograms of water.

How did I find the answer? I took the weight of the brain and converted it into grams which is 1400 grams. Then I multiplied that by .7 and I got 980. Then I converted that value into kilograms which ended up being .98

More Like This
Ask an advisor one-on-one!
Advisor

Accurate Aleks Answers

Education, Online Tutoring, Homework Assistance

Advisor

Kids Math Games

Education, Children's Entertainment, Online Games

Advisor

Fun Math Games for Kids

Education, Children's Entertainment, Online Learning

Advisor

Research Help Desk

Academic Research, Journal Publishing, Research Assistance

Advisor

University Homework Help

Education, Consulting, Finance