Answer:
so what you have to do first is simplify into variables
S=A 3/4 stack of index cards
C= 3/160
first you can do this with a calculator, divide 3/4 of an inch by 3/160 of an inch.
3/4÷3/160=40
Here is my work shown :)
Male the division into multiplication and swap the numbers in 3/160 to 160/3
3/4 x 160/3
For fraction multiplication, multiply the numerators and then multiply the demoninators to get
3 x 160/4 x 3= 480/12
Divide 480 by 12 which is forty
there you go :) sorry if the answers are messed up and there are spelling errors. but in conclusion the answer is 40
By the way, awesome pfp, I just started watching Toilet Bound Hanako earlier tonight and it's very good so far