Jane has $7 and her sister had $2. their parents have each of them an equal amount of money. then, jane had twice as much money as her sister. how much money did their parents give each of them?

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  $3

Step-by-step explanation:

The difference in the amounts doesn't change when each girl is given the same gift. That difference is $5. If Jane ends up with twice the amount her sister has, and that is $5 more, then Jane ends up with $10 and her sister ends up with $5.

$3 was given to each girl.

If x is the amount given to each girl, the equation can be ...

  (x+7)/(x+2) = (2)/(1)

  x +7 = 2x +4 . . . . multiply by (x+2)

  3 = x . . . . . . . . subtract x+4

  $3 was given to each girl.

circle area = pi * radius^2

if diameter = 10 then radius = 5

circle area = pi * 5^2

circle area = pi * 25

circle area = 78.5398163397 square units

step-by-step explanation: