Dante has 5 times as many marbels as kenny juan has 1/3 as many dante if kenny has 30 marbels how many marbels does juan have

Let:
Dante = d
Kenny = k
Juan = j

Given:
d = 5k
j = 1/3 d
k = 30

Solve:

d = 5k
d = 5(30)
d = 150

j = (1/3) * 150
j = 150/3
j = 50

Solution:
Dante = 150
Juan = 50
Kenny = 30

If kenny has 30 marbles
and dante has 5 times that amount
dante has (30 x 5) marbles = 150

then Juan has (1/3 of 150) marbles = 50
ANSWER: Juan has 50 marbles

hope this helps! comment if further explanation is needed :)