A person weighing 40kg has about 3litres of blood. In a drop of blood (1 cu. mm), there are nearly 5*10⁶ red blood cells, each of                   which is about 0.0mm in diameter. How many red blood cells are there in a person weighing 40 kg? If we are to form a chain of these red blood cells, how long will this chain be? Leave your answer in exponential form. 

Answer :

Given  : A person weighing 40 kg has about litres of blood.

And

A drop of blood (1 cu. mm), there are nearly 5$\times$10⁶ red blood cells .

We know

1 liter  =  1000000 mm³ 
So,

3 liter  =  3 $\times$10⁶ mm³ 

So,

Total  red blood cells are there in a person weighing 40 kg = 3 $\times$10⁶ $\times$  5$\times$10⁶  =  15$\times$10¹²                       ( Ans )
And
Diameter of re cells  = 0.0 mm ( Given ) , Please recheck that value as if diameter of red cell  = 0.0  mm So

Length of all red cells  = 15$\times$10¹²$\times$ 0. 0 = 0 mm , That is wrong .

Kindly recheck your given data and get back to us , So we can help you precisely  .