Clarence, Amir and Jun Wei received some stickers. The ratio of the number of stickers that Clarence received to the number of stickers Amir received was 4 : 9. The ratio of the number of stickers Jun Wei received to the number of stickers Amir received was 4 : 3. Clarence received 24 stickers. How many stickers did Jun Wei receive? Ans: ___

1. Identify the common term and combine the two ratios into a single ratio

Clarence : Amir = $4 : 9$
Jun Wei : Amir = $4 : 3$
To make Amir's units the same in both ratios, multiply the second ratio by $3$:
Jun Wei : Amir = $12 : 9$
Combined ratio Clarence : Amir : Jun Wei = $4 : 9 : 12$

2. Find the value of 1 unit using Clarence's stickers

Clarence has $4$ units.
$4 \text{ units} = 24$
$1 \text{ unit} = 24 \div 4 = 6$

3. Calculate the number of stickers Jun Wei received

Jun Wei has $12$ units.
$12 \text{ units} = 12 \times 6 = 72$