Lily swims a 100-meter race. She swims the first half in 27.8 seconds. She swims the second half in 30.12 seconds. About how
long does it take Lily to swim the whole race? Choose the best
estimate.
A 170 seconds
B 158 seconds
C 58 seconds
D 42 seconds

c

Step-by-step explanation:

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answer: the answer is one of

step-by-step explanation:   we are given to write a proper fraction where the whole is divided into an even number of equal parts less than ten, and an odd number of those parts exist.

an even number less than 10 may be one of 2, 4, 6 or 8. so, the whole may be one of these four evens.

now, an odd number of these parts must exist, so the numerator must be an odd number, one of 1, 3, 5 or 7. it cannot be 9 because then the fraction will become improper.

thus, our fraction may be one of the following