Mr Green: [tex]4(3a+1+2b) = 12a + 4 + 8b[/tex]
Mrs Green: [tex]6(5a-a)+4(2+4b)=6*4a + 8 + 16b = 24a +16b + 8[/tex]
Keith: [tex]4(2+4b+6a) = 8 + 16b + 24a=24a+16b + 8[/tex]
Kevin: [tex]4(6a+2)+8b + 2 = 24a + 8 + 8b + 2 = 24a + 8b + 10[/tex]
Thus Mrs Green and Keith has the expression that is equivalent to
'24a + 16b + 8'
Hope that helps!
