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Given that your grade for your computing is based on 5 coursework that weigh differently, and you know the results of 4: 80, 75, 50 and 90 which weighs 10%, 20%, 45% and 5%. What grade do you need in your last coursework to achieve at least a B (70%)?

You know the following: A) 80, 10% B) 75, 20% C) 50, 45% D) 90, 5% E) X, (100-10-20-45-5)% = 20% Therefore, create a formula with the facts given and the mean marks must be at least 70. Note that 10% is equi...
CZ
Answered by Chen Z. • Maths tutor
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How do I solve a quadratic equation?

To solve a quadratic equation we need to find the value of x for which a x 2 +b x+c=0,where a,b,c are constants.There are some well known formulas which you should get accustomed with.However,in this answer,...
MG
6312 Views

How do you solve this problem?

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...
MG
9798 Views

How do I make calculations with percentages?

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...
MG
5193 Views

How can I find x and y?

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...
MG
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