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The problem is: ‘Tom travels from a to b and at a speed of 90km per hour. It takes him time ‘t’. Alice travels from a to b at a speed of 70km per hour. It takes her time ‘t+ 1 hour’. How long did it take for...

There is a simple way of making calculations with percentages. Say you want to subtract from a numerical value x,20%. Then multiply it with 80/100. Say you want to add 20%.Then multiply with 120/100. Say you...

Many students ask how they can they find 2 unknowns,given 2 simple equations. I'll try to focus in this answer on giving students a tool which they can use to solve ANY 2 simple equations with one solution.L...

A parametric equation is defined by a variable t such as y = 4t +1 and x = 2t, while general equation is defined sorely by y and x (in 2 dimensional space). As t is the free variable you can simply replace t...

32 out of 80 on a Maths test38% on an English test As we don't know any other information about the English test (e.g. her mark and the total mark) the only way that we can compare the two results is by usin...