Question

In a class of 40 students, the number
of boys is 4 more than the number of
girls. The average weight of the
entire class is 48.4 KGs. If the
average weight of girls is 44 KGs,
what is the average weight of boys?

Answer 1

Answer:

Average weight of boys = 52

Step-by-step explanation:

girls =A boys =B

A+B =40      B=(A+4)

A+(A+4)=4  2A+4 =40

2A=40-4=36

A=36/2 = 18   girls 18, boys 22

weight of  22boy =(total average weight x total  students)-

                                        (total girls x avg weight of girls)

                                      = (48.4 x40 - 18 x 44)

                                      = 1936 - 792 = 1144

average weight of boys = 1144 / 22 = 52