A sample of iron-59 contains 50mg. One hundred days later, the sample contains 10.75 mg. What is the half-life of iron-59, in da
ys?
1 answer:
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Answer: The correct option is (B) 24 : 25.
Step-by-step explanation: Given that the perimeter of square region S and the perimeter of rectangular region R are equal and the sides of R are in the ratio 2 : 3.
We are to find the ratio of the area of R to the area of S.
Let 2x, 3x be the sides of rectangle R and y be the side of square S.
Then, according to the given information, we have
Therefore, the ratio of the area of R to the area of S is
Thus, the required ratio of the area of R to the area of S is 24 : 25.
Option (B) is CORRECT.