Curing Cancer
Algebra
Level
1
A cancer patient has a tumor containing approximately one trillion ( ) cancer cells. He receives a treatment that kills 99.999% of the diseased cells. How many cancer cells remain?
The answer is 10000000.
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1 solution
1 , 0 0 0 , 0 0 0 , 0 0 0 , 0 0 0 ∗ 0 . 0 0 0 0 1 = 1 0 , 0 0 0 , 0 0 0 . There are 10 million ( 1 0 7 ) cancer cells remaining in the tumor.