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White paint costs £2.80 per litre. Blue paint costs £3.50 per litre. White paint and blue paint are mixed in the ratio 3 : 2 Work out the cost of 18 litres of the mixture.

To work out how many litres of white and blue paint is needed, use the ratio 3:2. To find the specifc ratio for 18 litres, of paint: 2+3=5, 18/5=3.6 so (3:2) 3.6 becomes 10.8:7.2 (check 10.8+7.2=18). So to d...
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Answered by Aidan D. • Maths tutor
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Rearrange to make x the subject of the equation: 4(3x+y) = 12-2y

To tackle this question, start by expanding the brackets: 12x + 4y = 12 - 2y Making x the subject of the equation requires x to be on its own. So, in this example, we need to first get rid of the 4y. Given t...
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Answered by Mana R. • Maths tutor
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Make y the subject of the formula p=((x+y)/5)^(1/2)

To "make y the subject" basically means to get an expression in the form y= a function of the other variables (in this question, x and p). This will involve adding, subtracting, multiplying and div...
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Answered by Tom W. • Maths tutor
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How do you multiply out two brackets?

Let us use the example of (x + 3)(x + 5) The main thing we have to remember is to multiply every term in the first bracket by every term in the second bracket. An easy way to make sure we've done this is to ...
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Answered by Elliot T. • Maths tutor
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Write an algebraic expression to show the area of a square with side length x+4

x 2 + 8x + 16
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Answered by Anna B. • Maths tutor
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