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taminazaka1
20.07.2019 •
Mathematics
My sister is 3 times as old as i am. five years from now, she will be twice as old as i will be. how many years old is my sister now?
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Ответ:
Me: M
Son: S
5 years ago, I was 3 times as old as my son
M-5 = 3(S-5)
M-5=3S-15
M-3S=-101
5 years hence, I will be twice as old as him,
M+5=2(S+5)
M+5=2S+10
M-2S=52
equation 2-1
(M-2S) - (M-3S) = 5 - (-10)
S=15
If S=15, M=35
hope this helps
Ответ:
the answer is 1
Step-by-step explanation: