Simple Formulae
Maths: Edexcel IGCSE Higher, topic 2.2.2
Simple Formulae from Real-World Contexts
Algebraic formulae can be used in real world contexts.
The cost of hiring a car
- This formula expresses the cost of hiring a car:
- The number of days: n
- The number of miles: m
- The cost of hiring a car: £100 per day
- The cost of petrol: £0.1 per mile
Measuring a perimeter
- This formula expresses the perimeter of a rectangle:
- Long sides of the rectangle: a
- Short sides of the rectangle: b
Calculating the food shop
- This formula expresses the cost of a food shop:
- Number of pints of milk: p
- Number of loaves of bread: q
- Price of a pint of milk: £1
- Price of a loaf of bread: £0.70
Test yourself on Simple Formulae
The cost of hiring a printer is £21 per month, The number of ink cartridges used is 1 per 100 pages printed. The number of months is b. The number of pages printed is a.
Which of the following equations expresses this information?
Paulo and Ines are going on holiday. They are hiring a car at £100 per day. They want to travel 20 miles a day in the car for y days. A mile of petrol costs x. Which of the following formulae express this?
Sandra and Bill want to make a fence for their garden. They only need to build a fence for 3 sides of the lawn, as their house is on one side. The lawn is rectangular. One side is P and the other is Q. The house is on side P. Which of the following formulae expresses this information?
The cost of pick 'n mix sweets is £2 per 100g. Jack gets y grams of sweets and Jill gets x grams of sweets. What is their total cost?