-------------------------------------------------------
Information Given
-------------------------------------------------------
48 invitations were sent out.
4/5 of the invitation were sent out.
-------------------------------------------------------
Construct the equation and find 1 whole
-------------------------------------------------------
4/5 = 48 invitations
1/5 = 48 รท 4 = 12
5/5 = 12 x 5 = 60
-------------------------------------------------------
Soon-Jin sent out 60 invitations.
-------------------------------------------------------