Question

MODELING REAL LIFE
Platelets are cell-like particles in the blood that help form blood clots.

a. How many platelets are in 3 milliliters of blood? Write your answer in standard form.
b. An adult human body contains about 5 liters of blood. How many platelets are in an adult human body?

Answer 1

(a)

Step1. Count platelets in 3 milliliters of blood.

As there are $2.7\times {10}^8$ platelets per milliliters of blood .

Hence platelets in 3 milliliters of blood = $3\times 2.7\times {10}^8$

= $8.1\times {10}^8$

Step2. Writing $8.1\times {10}^8$ in standard form

$8.1\times {10}^8=810,000,000$ (Move decimal point $\left|8\right|=8$ places to the right )

(b) Platelets in an adult human body

An adult human body contains about 5 liters of blood

As there are $2.7\times {10}^8$ platelets per milliliters of blood .

Hence platelets in 5 milliliters of blood = $5\times 2.7\times {10}^8$

= $13.5\times {10}^8$

= $1.35\times {10}^9$