Decrease and Increase in Ratio:
If the no. of teachers in a college is increased from 50 to 60. Then the ratio of new staff and old staff is
i.e.
We say that, no. of teachers has been increased in ratio 6 : 5. In other words, no. of new staff is times the no. of old staff.
Hence
Rule:
To increase a no. “” we multiply by an improper fraction.
Similarly to decrease a no. “” we multiply by an proper fraction.
e.g. (1) Increase Rs. 20 in ratio 6 : 5
New value =
e.g. (2) Decrease 56 in ratio 7 : 8
New value =
