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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.

Understanding of the ratio: 2+3=5, 3/5 is white, 2/5 blue, 2.8 18 (3/5) + 3.5 18 (2/5) No calculator paper, so check ability to do accurately arithmetic as above and make sure to think about the answer as co...
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Answered by Rhys T. • Maths tutor
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A rectangular path has perimeter of 240m. If the rectangle is split lengthways, two paths of 160m are formed. Work out the lengths of the sides of the original path.

Firstly, make sure to draw a picture! Worded questions are used to catch people out. Drawing a diagram makes solving certain problems much easier. Secondly, notice that we are asked for two pieces of informa...
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Answered by Henry D. • Maths tutor
4182 Views

Solve for x, y, and z: 5x - 2y = 19 , 3x + 3z = 21 , y + z = 2

Like when there are two unknowns, the best way to solve this kind of problem is to rearrange and substitute, but because there are three unknowns, it's a bit more fiddly. To solve this you want to pick and i...
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Answered by Dan T. • Maths tutor
8185 Views

A gym has 275 members. 40% are bronze members. 28% are silver members. The rest are gold members. Work out the number of gold members.

Firstly, we can calculate the total percentage of gold members = Total - bronze - silver Therefore, %gold = 100% - 40% - 28% = 32% So we know that 32% of 275 members are gold, and to find the total number of...
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Answered by Sarah S. • Maths tutor
10789 Views

How to calculate sin, cos and tan

SOH CAH TOA (imagining each as a triangle) S = sin C = cos T = tan O = opposite H = hypotenuse A = adjacent
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Answered by Phoebe H. • Maths tutor
3657 Views