If the number of teachers in a college is increased from 50 to 60. Then the ratio of new staff and old staff is

We say that, number 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 =

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