Mean weight of $m$ boys; find $m$ [closed]

Mean weight of m boys is $43$ kg. If the teacher who weighs $63$kg is included the mean becomes $45$ kg. What is the value of $m$?

• Yes m is a number of boys – Bhavin Nov 22 '16 at 16:24
• This is not a 'do my homework for free' service!!! – barak manos Nov 22 '16 at 16:29
• Where are you struggling with this question? – Kitter Catter Nov 22 '16 at 16:29
• How further this equation is elaborate? (∑xi+63)/(m+1)=45 – Bhavin Nov 22 '16 at 16:32
• I have solved it. Thank you for your reply. – Bhavin Nov 23 '16 at 7:21

Solve for $\sum{x_i}$ and $m$:
$\sum{x_i}/m=43$ and $(\sum{x_i} +63)/(m+1)=45$
• Obviously giving $m=9$! – rbm Nov 22 '16 at 16:24