1. which is bigger 3/4 or 4/5
or ?
2. which is bigger: 0.3 or 1/3
3. increase £60 by 10%
4. decrease £40 by 10%
5. divide £56 in a ratio of 5: 3

1. 4/5

2. 1/3

Step-by-step explanation:

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The actual decrease is 15000-12000, or 3000, tickets.

Divide this 3000 by the original 15000:

  3000         3
= =  0.2.  Multiplying this by 100%, we get 20%.
15000        15

"Decrease" signifies a negative quantity.
We could say either that the ticket sales decreased by 20%, or 
that the change was -20%.