Question

the weight of boy and girl is 118kg. the weight dog and boy is 78kg . the weight of girls and is 72 kg then find the weight of boy, Girl,

Answer 1

118kg..
hope its right...

Answer 2

let
weight of a boy be 'x'
weight od a girl be 'y'.
weight of a dog be 'z'.
given
boy+girl=118kg
x+y=118kg
dog+boy=78kg
z+x=78kg
girl+dog=72kg
y+z=72kg

x+y+z+x=118+78
2x+y+z=196
2x+y+z+y+z=196+72
2x+2y+2z=268
2(x+y+z)=268
x+y+z=268/2

x+y+z=134

we know that y+z=72kg
therefore,
x+72kg=134kg
x=134-72
x=62kg
therefore,
boy's weight =62kg

x+y+z=134kg

we know that x+z=78k
therefore,
y+x+z=134kg
y+78kg
y=134-78
y=56kg
therefore,
girl's weight =56kg