Let the weight of the heavier boy be M and lighter boy be m
Since in the first condition to be in equilibrium their moment must be equal
M×0.5=m×1M=2m .......(1)
in the next condition
(m+10)×1.5=M×31.5m+15=3M ..............(2)
from (1) and (2)
we get m=3.33 Kg and M=6.66 Kg
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