Introduction to Ratios

Dividing both numbers by their greatest common factor 6. Then $18÷6=3$ and $24÷6=4$, resulting in $3:4$.

The ratio of oranges to apples is simply the reverse of the ratio of apples to oranges, which is $5:3$.

Dividing £300 by 5 gives £60 per part, and then multiply by 3: $3\times 60=180$.

The ratio of pencils to pens is $5:3$, so the total ratio of parts is $5+3=8$. To find the number of pencils, calculate $(5/8)\times 40=25$.

The ratio of red to blue marbles is $4:5$. If 4 parts equal 36, each part is $36÷4=9$. So the blue marbles are $5\times 9=45$.

If 5 parts equal 150 adults, each part is $150÷5=30$. The total is 8 parts, so $8\times 30=240$.