Mathematics: Sarah is twice as old as john. six years ago, sarah was 4 times as old as john was then. how old is john now?

Sarah is twice as old as john. six years ago, sarah

Ответ:

cravingnafi202

30.12.2021

$J- John's\ age\ now\\S-Sarah's\ age\ now\\\\S=2J\ \ \ and\ \ \ S-6=4(J-6)\ \ \ \Rightarrow\ \ \ 2J-6=4J-24\\\\2J-4J=-24+6\\\\-2J=-18\ /:(-2)\\\\J=9\\\\Ans.\ Now\ John\ is\ 9.$

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Ответ:

Zarek2853

31.01.2021

Mathematics

C. translation is moving to a different spot. rotation has to have the letters in the same spot when rotating it. reflection is a mirror so its C.

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Sarah is twice as old as john. six years ago, sarah was 4 times as old as john was then. how old is john now?

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