Question

The number of red blood cells per cubic millimeter of blood is approximately 5.5 million. If the average body contains 5 L of blood what is the total number of red cells in the body? Write the standard form.
$(1L=1000000m{m}^3)$

Answer 1

The average body contain 5 L of blood.
Also the number of red blood cells per cubic millimetre of blood is approximately 5.5 million .
Blood contained by body $=5L=5\times 1000000m{m}^3$
$Redbloodcellsin5\times 1000000m{m}^{3}ofblood$
$=5.5\times 1000000\times 5\times 1000000=5.5\times {10}^6\times 5\times {10}^6=5.5\times 5\times {10}^{6+6}[a^m\times a^n=a^{m+n}]=27.5\times {10}^{12}=2.75\times {10}^1\times {10}^{12}=2.75\times {10}^{13}$