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Let James = x 

Mike = x+8

Sam = Mike+5 = (x+8)+5 = x+13

Altogether: James + Mike + Sam = 72

Therefore, x + (x+8) + (x+13) = 72

Now solve for x: 3x + 21 = 72

Bring...

To begin you must identify the co-efficients of each x term, essentially what number comes before x² , x and the integer value.

a = 1, b = 3, c = -4 . We then substitute these values int...

A thorough understanding of all the mathematical formulas prescribed in the subject specification is crucial for your survival in the no-mans-land of the maths exam, where your examiner tries his best to ...

Start by identifying the cost of one cricket ball: £169.04 ÷ 8 = £21.13 Next multiply this by the number of cricket balls he wants to buy: £21.13 x 19 = 401.47 The total cost of 19 cricket balls is £401.4...

300 x 1/10

= (300/10) x 1

= 30 students sat on chairs

85% of 300 

= (300/10) x 8.5

= (30 x 8) + (30 x 0.5)

= 240 + 15

= 255 students sat on the floor