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# Maths question #2 watch

1. A 70kg patient has approximately 8 pints of blood. The patient donates 470mL of blood. Approximately what fraction if his body's blood is this? (1 pint = 568mL)

I did:
568*8 = 4544
so I got 470mL/4544mL
I'm assuming that I will have to simplify but I don't know where to start

The answer is supposed to be 1/10
2. (Original post by Rana Rashid)
A 70kg patient has approximately 8 pints of blood. The patient donates 470mL of blood. Approximately what fraction if his body's blood is this? (1 pint = 568mL)

I did:
568*8 = 4544
so I got 470mL/4544mL
I'm assuming that I will have to simplify but I don't know where to start

The answer is supposed to be 1/10
Because the question says "approximately" and 4544 is fairly close to 4700, writing 1/10 is acceptable. The actual fraction is closer to 10/97
3. (Original post by Rana Rashid)
A 70kg patient has approximately 8 pints of blood. The patient donates 470mL of blood. Approximately what fraction if his body's blood is this? (1 pint = 568mL)

I did:
568*8 = 4544
so I got 470mL/4544mL
I'm assuming that I will have to simplify but I don't know where to start

The answer is supposed to be 1/10
So:
Patient's body blood: 8 pints
Donates: 470ml
1 pint = 568ml

First do the amount he donates divided by 1 pint. 470/568 = 0.82646479
This is the % of blood he donated if he only had 1 pint of blood. So divide this by 8 (the no of pints he has)
0.82646479 / 8 = 0.1034331 so approx 10%

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