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December 21, 2014

December 21, 2014

Posted by **Mark** on Wednesday, March 13, 2013 at 2:40am.

- There are five chidren in the Roberts family. Amy and Ariel are twins. Brett and Bart are also twins. Amy's age plus Brett's age is 25years. Ariel's age plus Charlene's age is 27 years . Bart's age plus Charlene's age is 20 years. What is the sum of the ages of all 5 children in the Roberts fanily?

- math problem -
**Reiny**, Wednesday, March 13, 2013 at 7:41amreturn = 5000(1.25) + 5000(.8)

= ...

#2

let Amy and Ariel' age be x

let Brett and Bart's age be y

let Charlene's age be z

x+y = 25

x + z = 27

y+z = 20

2nd minus the third

x - y = 7

add that to the first

2x = 32

x=16

in the 1st:

16+y = 27

y = 11

in the third:

11+z = 20

z = 9

so we have 2x + 2y + z

= 32+22+9 = 63

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