Answer:

Let x be the number of members in Team Blue.

Since there are 4 less members in Team Red than Team Blue, Team Red has x - 4 members.

After 7 members are transferred from Team Red to Team Blue, the total number of members in Team Red becomes 1/3 the number of Team Blue.

So, (x - 4 + 7) = 1/3(x)

So, x - 4 + 7 = x/3

We can now simplify this equation by multiplying both sides by 3

3x - 12 + 21 = x

2x = 33

x = 16

So Team Blue has 16 members

Team Red has x - 4 = 16 - 4 = 12 members.

Therefore, Team Red has 12 members and Team Blue has 16 members