Jack has x plus 3 marbles Angus has 5 times the number of marbles Jack has How many marbles do Jack and Angus have in total?

Jack has [ 1 (x+3) ].

Angus has [ 5 (x+3) ].

Together they have [ 6 (x+3) ].

That's all we can tell from the information given.

The total could be

3 + 15 = 18

4 + 20 = 24

5 + 25 = 30

6 + 30 = 36

7 + 35 = 42

etc.