设捐5元有x人,
12×2+5x+(42-12-x)×10=229,
24+5x+300-10x=229,
324-5x+10x=229+5x,
324-229=229+5x-2290,
95=5x,
95÷5=5x÷5,
x=19,
42-12-19,
=30-19,
=11(人),
答:捐5元有19人,捐10元有11人.