Balls

The boys changed stamps, beads and balls. For 9 balls is 3 stamps, 2 balls is 44 stamps. How many beads is for 1 ball?

Correct answer:

x =  66

Step-by-step explanation:

$$\begin{gathered} 9a=3b \\ 2c=44b \\ b=9\mathrm{/}3a \\ 2c=44b=44\mathrm{/}3\cdot 9a \\ x=c\mathrm{/}a=44\mathrm{/}3\cdot 9\mathrm{/}2={\displaystyle \frac{44}{3}}\cdot {\displaystyle \frac{9}{2}} \\ x=66 \end{gathered}$$

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