Three percent of Jennie’s skin cells were burned when she escaped from a fire. If 3.7 × 10^10 (10 to the 10th power) of her skin cells were burned then, how many skin cells were not burned?

Answer 1

3.7 * 10^10 is 3% of the skin cells that were burned.

SHe had/has X skins cells

the 3% of X = 3.7 * 10^10

0.03 X = 3.7 * 10^10 <-- 3% = 0.03

3 X = 3.7 * 10^12 <-- multiplies by 100 to clear the decimal

X = 1.23 * 10^12 <00 divides by 3

3% were burned so 100%-3% = 97% were not

97% = 0.97

0.97 * 1.23 * 10^12

= 1.1963 * 10^12