Two dogs

Izzy's dog is 10 1/2 years old. Paige's dog is 18 months old. How many years older is Izzy's dog?

Correct answer:

d =  9

Step-by-step explanation:

$$\begin{gathered} I=10+{\displaystyle \frac{1}{2}}={\displaystyle \frac{21}{2}}=10\frac{1}{2}=10.5\text{ y } \\ P=18\mathrm{/}12={\displaystyle \frac{3}{2}}=1\frac{1}{2}=1.5\text{ y } \\ d=I-P=10.5-1.5=9 \end{gathered}$$

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