Question 1005426
Let their ages be:
{{{ x }}}        ( Greggy )
{{{ x+2 }}}   ( Gerry )
{{{ x + 4 }}} ( Gary )
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{{{ ( x + 4 ) + 3 = 2*(( x ) + 3 ) - 8 }}}
{{{ x + 7 = 2x + 6 - 8 }}}
{{{ x = 7 + 2 }}}
{{{ x = 9 }}}
and
{{{ x+2 = 11 }}}
{{{ x + 4 = 13 }}}
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Their ages are 9, 11, and 13
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check:
Gary is 13
In 3 yrs he will be 16
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In 3 yrs Greggy will be 12
Twice Greggy's age is 24
8 less than 24 is 16
OK