Thursday

December 18, 2014

December 18, 2014

Posted by **Ant14** on Tuesday, May 22, 2012 at 7:22am.

- Math -
**Jai**, Tuesday, May 22, 2012 at 7:59amlet x = age of Travis

let x-4 = age of Ellie (since Travis is four years older than Ellie)

let 2(x-4) = age of Mac (since he is twice older than Ellie)

since the sum of their ages is 44,

x + x - 4 + 2(x - 4) = 44

2x - 4 + 2x - 8 = 44

4x - 12 = 44

4x = 56

x = 14 yrs old (Travis)

x-4 = 10 yrs old (Ellie)

2(x-4) = 20 yrs old (Mac)

hope this helps~ :)

- Math -
**CHIMA**, Tuesday, July 3, 2012 at 4:23amA CIRCULAR PIECE OF CARDBOARD IS TRIMMEM IN SUCH A WAY THAT ITS CIRCUMFERENCE IS REDUCED IN THE RATIO 3:7. IN WHAT RATIO IS THE SURFACE AREA REDUCED?

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