Step 1
Let the energy drink be x
Step 2
1/4 of the energy drink left = (1/4)x = original amount
Step 3
1/4 of 1/4x = 1/4 x 1/4x = (1/16)x = amount drank
Step 4
Find much of the energy drink you have left
Fraction of energy drink left = Original amount - amount drank
Fraction of energy drink left = (1/4)x - (1/16)x = (3/16)x
Hence you will have 3/16 of the energy drink left
