Books borrowed = 3/20 times
64+( 1-3/20)x = x( 1- 1/20)
x=640
There are 640 books.
I have a deposit of X yuan in the bank.
( 1-2/5)x+ 124=940
3/5x=8 16
x= 1360
I had a deposit in the bank 1360.
3. It turns out that * * * bought X and skipping rope.
( 1-3/4)x+50=3/4x
2/4x=50
x= 100
It turns out that * * * bought a skipping rope of 100.
4. See /question/43234 109.html? si=5