Answer:
31 oranges
Step-by-step explanation:
Let n be the number of oranges and m be the number of bags Mr. Teo has.
If he packs 5 oranges in each bag, then he packs 5m oranges in m bags and since he is short of 4 oranges,
[tex]n=5m-4.[/tex]
If he packs 4 oranges in each bag, then he packs 4m oranges in m bags and since he has 3 oranges left,
[tex]n=5m+3.[/tex]
Equate right sides of these two equations:
[tex]5m-4=4m+3,\\ \\m=7.[/tex]
Hence,
[tex]n=5\cdot 7-4=31.[/tex]
