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(a) In order to add or subtract any fractions, they must first have a common denominator. For this example, I will take this to be 30. Looking at 3/10: in order to change the denomintor to 30, we must mul...

If you have a fraction divided by another fractions things can get tricky, but there is an easy way to avoid getting triple decker fractions! Have a look at this example: (1/2) / (2/5) = (1/2) x (5/2) = (...

first of all it is best to get rid of the brackets. You do this by times each component in the bracet by the number on the outside in this case it is 2.

7x + 8 = 12x - 4

then you want to get...

Solving a simultaneous equation finds the point(s) where two lines on a graph intercept. Therefore, one way of solving the equations is to plot the two lines onto the same graph and find the coordinates o...

The mixture has a ratio of 3:2, white to blue paint. 
3+2=5 so there are 5 parts to the mixture, 3 white and 2 blue.
We know the cost of 1 litre of each, so first we can work out the cost of 1...