If $4$ wands are equivalent to $6$ rands and $24$ rands are equivalent to $8$ fands, how many wands are equivalent to $5$ fands?
I want to find a way to convert fands to wands using the given equivalences. I notice that both equivalences involve rands, so I can use them as a common currency to compare fands and wands. To do that, I need to find the rate of exchange between fands and rands, and between rands and wands. The first equivalence tells me that $4$ wands are worth $6$ rands, so dividing both sides by $4$, I get that $1$ wand is worth $\frac{3}{2}$ rands. The second equivalence tells me that $24$ rands are worth $8$ fands, so dividing both sides by $8$, I get that $1$ fand is worth $3$ rands. Now I can use these rates to convert $5$ fands to wands. To do that, I multiply $5$ fands by the rate of rands per fand, and then divide by the rate of rands per wand. That is, $5$ fands times $3$ rands per fand divided by $\frac{3}{2}$ rands per wand. Simplifying, I get $5 \times 3 \div \frac{3}{2} = 10$. Therefore, $5$ fands are equivalent to $10$ wands. 