NobleWho
07.10.2019 •
Mathematics
Kathy is 6 years younger the bill. twelve years ago, bill was twice as old as kathy was then. how old are they now?
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Ответ:
b= Bill's age now
(1) k=b-6
(2) b-12=2 x (k-12)
(2) b-12=2k-24
(2) 2k-b=12
From (1)
(1) -k+b=12
Add (1) and (2)
k=18
and
(1) k=b-6
18=b-6
b=24
Kathy is 18 and Bill is 24
check:
(2) b-12=2 x )k-12)
24-12=2 x (18-12)
12=12
OK
Ответ:
A and D
Step-by-step explanation: