Use the calculator for these calculations. Round your answer to the nearest thousandth, if necessary: 18x(27+36/3) (21+36/74-18x3)x10 square root of 3/2 square root of 281^2-160^2 2^10-2^9 square root of 8x square root of 9-7

This is old riddle

ok

xyz=72
sum
what we do is summ up the 3 parts of 72
so what I means is
factors of 72 that are in groups of 3
so example
1,1,72
thos are the ages of the youngest and oldest

so if we looked at all of them and added them up
1+1+72=74
1+2+36=39
1+3+24=27
1+4+18=23
1+6+12=19
1+8+9=18
2+2+24=39
2+3+12=17
2+4+9=15
3+3+8=14
3+4+6=13

we notice that there are no 2 same results exept for
1+2+36=39 and2+2+24=39

so therefor the last hint
'youngest childe is called justice'  tells us that there is a youngest child

therfor since 2=2 2 is not younger than 2 so
1,2,36 are the ages
 1,2,3,4,6,8,9,12,18,36,72