dimetriawilliam
dimetriawilliam dimetriawilliam
  • 06-05-2017
  • Mathematics
contestada

Chris is 2 years old and Jenny is 4 years old in how many years will Jenny be 7 years younger than twice Chris age

Respuesta :

irspow
irspow irspow
  • 06-05-2017
c=2 and j=4

j+y=2(c+y)-7

j+y=2c+2y-7  and since j=4 and c=2 we have:

4+y=2*2+2y-7

y+4=2y+4-7

y+4=2y-3

-y+4=-3

-y=-7

y=7

So in 7 years Jenny will be 7 years younger than twice Chris' age.

check...

4+7=2(2+7)-7

11=2(9)-7

11=18-7

11=11
Answer Link
Аноним Аноним
  • 06-05-2017
Let's write out all the possibilities. 

2, 3, 4, 5, 6, 7,  8,   9,  10, 11, 12, 13
4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15

The correct answer is 7 years.

Hope this helped! Comment or DM me if you have any more questions. :)
Answer Link

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