Question

a miniature railway increased its prices by 25% to £1.50 how much did it cost to visit the railway before

Answer 1

The answer is 112.5

type 150 divide by 100 times 25
minus that from 150
and it gives you the answer

Answer 2

Let x be the previous price. 
So, the equation is the following: $x+0.25x=1.5$
Solve the above equation for x like this:
$x(1+0.25)=1.5\\x1.25=1.5\\x=\frac{1.5}{1.25}=1.2$

The price before was £1.2