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01.03.2020 •
Mathematics
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Ответ:
4/10
Step-by-step explanation:
there's 10 equal selections and there's 4 chances that the spinner will land on A. 4/10 = 0.4 on the probability scale
Ответ:
x: Mary´s age
y: Mom´s age:
x + y = 67
3x + 7 = y
Replace y in the first equation:
x + 3x + 7 = 67
4x = 67 - 7
4x = 60
x = 15 yrs.
y = 67 - 15 = 52 yrs