Question 6576
Suzanne's weight is 1/2 of Kyle's. Margaret's weight is Kyle's plus 10.

{{{Suzanne + Kyle + Margaret = Kyle/2 + Kyle + (Kyle+10)}}}

All together they weigh 90 lbs:

*[invoke explain_simplification "Kyle/2 + Kyle + (Kyle+10)=90"]

So, Kyle's weight is 32 lbs and Margaret is 10 lbs heavier, so she must be 42 lbs. They are pretty little kids.