Question

Sarah, Amy and Liam stand on some weighing scales two at a time.
Here are the measurements:
Sarah and Amy
Sarah and Liam
Liam and Amy
70kg
80kg
80kg
How much does Liam weigh?

show working please :)

Answer 1

helpppppppp

Answer 2

:(

Answer 3

I don't know! sorry :( I love your new pic though :D

Answer 4

lol thnaks re-re

Answer 5

next time yhh :)

Answer 6

S+A=70
S+L=80
L+A=80
You see, that S+L=L+A => S=A
S+A=70=>A=70/2=35
and finally L=80-35=45

Answer 7

THNX MATH MAGICIAN UR A LIFE SAVER