mrsfitz98
07.06.2020 •
Mathematics
Andrew is trying to create a number puzzle for his younger sister to solve. He challenges his sister to find the mystery number. “When 4 is subtracted from half of a number the result is 5.” The equation to represent the mystery number is 1/2−4=5.
Andrew’s sister tries to guess the mystery number.
a. Her first guess is 30. Is she correct? Why or why not?
b. Her second guess is 2. Is she correct? Why or why not?
c. Her final guess is 4 1/ 2. Is she correct? Why or why not?
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Ответ:
a. she is not correct. half of 30 is 15 and 15 - 4 is 11.
b. she is not correct. half of 2 is 1 and 1 - 4 = -3.
c. she is not correct. half of 4 1/2 is 2 1/4 and 2 1/4 - 4 = -1 3/4.
the correct answer is 18. half of 18 is 9, and 9 - 4 = 5.
Ответ: