IDNStudy.com, ang iyong mapagkukunan para sa mabilis at eksaktong mga sagot. Magtanong at makakuha ng detalyadong sagot mula sa aming komunidad ng mga eksperto na may kaalaman.

There were 100 coins in a box.
The ratio of coins to notes was 4 : 7.
After 25 coins were removed and some notes were added to the box,
the ratio of coins to notes became 1 : 3.
How many notes were added to the box?