



 
Hi Bernie, If you knew the total weight of the team and the number of children on the team then you would find the average weight by dividing the total weight by the number of children. To say this algebraically let $T$ be the total weight of the children on the team in kilograms and $n$ be the number of children on the team then \[\frac{T}{n} = 50 \mbox{ kilograms}\] or \[T = 50 \times n.\] After Todd joins the team what is the total weight of the children on the team? What is the new number of children on the team? The new average weight is 51 kilograms so this gives you a second equation in $T$ and $n.$ Solve these equations for $n.$ Penny
 


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