Question

Ex : 33 ; 28 ................................

Answer 1

28.
(x+y+z)/3 = 16 =>x+y+z=48
x/4 = y/5 = z/7 = k
x=4k
y=5k
z=7k
____ +
16k=48 =>k=3
x=12
y=15
z=21

33.
0,5=1/2
0,(3)=1/3
0,25=1/4
x+y+z=36
x/2 = y/3 = z/4 = k
x=2k
y=3k
z=4k
____ +
9k=36 =>k=4
x=8
y=12
z=16