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To solve the equation means to make x the subject i.e. to make x on its own. Therefore, we need to add 6. If you add 6 to one side you must also add 6 to the other side. 

x-6+6 = 15+6

The ratio of 3:1 involves 4 units. 3 men +1 woman.

Find how many people each unit represents:

     4units        2476 people

Therefore each unit represents 247...

Standard form (sometimes called standard index form), is a way of writing out numbers.
It is especially useful when it comes to VERY large or VERY small numbers, which normally would take lots of tim...

simulatneous equations are solved by eliminating one of the unknowns such as x or y. there are a number of ways to do this such as substitution or subtraction/addition. For this example we will use subtra...

I would ask the student what they understood of percentages and if they understood the relationship between fractions and percentages. I would explain that 1% of a value is the same as 1/100 of a value...