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How do you work out the old price of an item having been given the new price after a specified percentage change?

These problems can be worked out using the equation: new = old x multiplier Where: new : is the new price of an item old : is the old price of an item (before it was changed) multiplier : is the percentage o...
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Answered by Rachael T. • Maths tutor
29919 Views

How do you go about rearranging equations where the required subject appears on both sides? Such as making x the subject of 7x + a = 3x + b.

To rearrange any equation, you must always do the same to both sides. If you take a number from one side, you must also take it from the other. If you divide a side by one number you must divide the other by...
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Answered by Rachael T. • Maths tutor
22476 Views

How do i solve a system of 2 equations?

This problem is one that can be confusing if not tackled orderly. Let us have an example of a system of 2 equation: 3x + 5y = 13 4x + 7y = 18 First we must choose one of the two and then express one of our v...
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Answered by Ioan I. • Maths tutor
5470 Views

Bag A contains £7.20 in 20p coins. Bag B contains only 5p coins. The number of coins in bag B is three-quarters of the number of coins in bag A. How much money is in bag B?

First you want to find out how many coins there are in bag A. So how many 20p coins do you need to make £7.20? This is the same as 720p. 720 divided by 20 is the same as 72 divided by 2 which is 36. So there...
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Answered by Anezka E. • Maths tutor
13075 Views

How should I go about factorising x^2+5x+6?

I always think of the middle number as the sum and the last number as the product (in this example, we have the sum as 5 and the product as 6!) This just means that we have to look for two numbers which add ...
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Answered by Laura W. • Maths tutor
4822 Views