The final answer is 15.
Here’s the logic:
First row:
Pair of earbuds + pair of earbuds + pair of earbuds = 30
So:
Pair of earbuds = 10
That means:
Single earbud = 5
Second row:
Person + person + pair of earbuds = 20
So:
Person + person + 10 = 20
Person + person = 10
Person = 5
Third row:
Pair of watches + pair of watches + person = 13
So:
Pair of watches + pair of watches + 5 = 13
Pair of watches + pair of watches = 8
Pair of watches = 4
That means:
Single watch = 2
Final row:
Single earbud + person × single watch
So:
5 + 5 × 2
Follow order of operations:
5 × 2 = 10
Then:
5 + 10 = 15
