neariah24
10.07.2019 •
Mathematics
Atechnique that ensures that every member of a population has an equal chance of being selected for a subset of the population is called random
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Ответ:
Ответ:
Jill = x
Jack = 10x
16 years later ...
Jill = x + 16
Jack = 10x + 16
Jack is twice as old as Jill ...
jack = 2 x Jill
10x + 16 = 2 (x + 16)
10x + 16 = 2x + 32
10x - 2x = 32 - 16
8x = 16
x = 2
Jill = 2 years old
Jack = 20 years old