Question

Jessica is 2 times as old as Luis. Eighteen years ago, Jessica was 5 times as old as Luis.
How old is Jessica now?

Answer 1

Too hard question it is shereen will help u she is smart in solving problems.hahha

Answer 2

Do you know how to start this?

Answer 3

@janxsgirl

Answer 4

this is linear equations damn easy

Answer 5

To start yuo will need to use theses equations where J is Jessica and L is Luis.
J=2L
J-15=(L-15)*5

Answer 6

From there it is pretty much guess and check.
Lets start with the number 20 for Luis
J=2(20)
J=40
40-15=(20-15)*5
25=5*5
25=25

These equation are equal so Jessica is now 40

Answer 7

40 is incorrect

Answer 8

Oh whoops it was supposed to be 18. I was pretty sure it said 15
J=2L
J-18=(L-18)*5

Now guess and check

Answer 9

Can you get it from there or do you want another example?

Answer 10

j=2l
j-18=5(l-18)
j-18=5(j/2-18)
j-18=5/2j-90
3/2j=72
j=2/3*72 = 48
jessica is 48

Answer 11

\(\Large\frak\color{lightgreen}{Correct}\)

Answer 12

Grats KhanAcademy