Question 115163
U=N+13
S=2N+2
U+S+N=47
(N+13)+(2N+2)+N=47
4N+15=47
4N=47-15
4N=32
N=32/4
N=8 MOONS FOR NEPTUNE.
U=8+13=21 MOONS FOR URANUS.
S=2*8+2=16+2=18 MOONS FOR SATURN.
PROOF:
8+21+18=47
47=47