Solution

156894

First name
Kieran and Owen
School
Ashfield Junior School
Country
Age
9

So first we had a pack of card 1-20 the number for the total was 35. In the first pile we had 12+16+7=35 in the second pile we had 3+19+13=35. Then in the third pile we had 9+14+4+8=35 then for the forth we had 17+18=35 for the fifth we had 11+1+2+15+6=35 for the sixth we had 5+10+20=35 and that's what we did to achieve the solution.