Numbers - Ratios
The recipe for flapjacks is 250 g of oats,
150 g of brown sugar and 100 g of margarine.
What fraction of the mixture is: a) oats? b) sugar?
The ratio of girls to boys in a school is 7:6. If there are 455 pupils in total, how many are a) girls? b) boys?
Sarah works as a waitress.
Each week, she splits her wage into spending money and savings in the ratio 7:3.
One week, Sarah earns £130.
How much should she put in her savings that week?
The next week, Sarah put £42 into her savings. How much did she earn in total that week?
An architect is drawing the plan of a house to a scale of 1 cm to 3 m.
a) Write this ratio in its simplest form.
b) How wide is a room that appears as 2 cm on the drawing?
c) The hall is 10 m long. How long will the architect need to make it on the drawing?
Concrete is mixed using cement,
sand and gravel in the ratio 1:3:6.
If Dave uses a 5 kg bag of cement, how much:
- sand does he need?
- gravel does he need?
- If Dave needs 80 kg of concrete, how much of each substance does he need?
Make sure you convert to the same units when you're -working out the ratio.
If I picked some strawberries after a few wet days.
Some were nibbled by snails,
some were mouldy and some fine.
The ratio was 2:3:10 respectively.
If 9 strawberries were mouldy how many:
a) were fine?
b) were not fine?
c) What fraction of the total amount were fine?
Salt & Vinegar, Cheese & Onion and Prawn Cocktail flavour crisps were sold in the school tuck shop in the ratio 5:3:2
If 18 bags of Prawn Cocktail were sold, how many bags: a) of Salt & Vinegar were sold? b) were sold altogether?