Answer:
9
Step-by-step explanation:
the answer is 9 because 7=y so , 7+2=9
Add it up then you will get answer
He is 38 kg.
I'll use only the first letters of their names, to make it simpler:
S+L=54.75
S+M=105
M=4L
S+4L=105
105-54.75=4L-L=3L
L=50.25/3=16.75
S=54.75-16.75=38
You solve by with by altitude! Hope it helps