ANSWER
Since probably part of the pie was already eaten therefore we find the fration of the pie in the beginning which is
= 1
= 5/5
Fraction William ate;
= 3/4 of 1
= 3/4 of 5/5
= 3/4 × 5/5
= 3/4
CONCLUSION
A fraction is a part of a whole so no matter how the fraction would increase or decrease the part William ate will remain the same