Question

police officer + police officer + police officer = 15
police officer + key = 12
police officer + candy + candy = 9
police officer + key + candy = ?

Explanation:

Step1: Find value of police icon

Let police = $P$. $3P=15$, so $P=\frac{15}{3}=5$

Step2: Find value of key icon

Let key = $K$. $P+K=12$, substitute $P=5$: $5+K=12$, so $K=12-5=7$

Step3: Find value of bone icon

Let bone pair = $B$. $P+B+B=9$, substitute $P=5$: $5+2B=9$, so $2B=9-5=4$, $B=\frac{4}{2}=2$

Step4: Calculate final expression

$P+K+B=5+7+2$

Answer:

14