Question

The number of adult passengers on a bus (excluding the driver) is three times the number of children. If there are a adult passengers on the bus, which expression shows the total number of people on the bus, including the driver?
13a+a+1

3a+a+1

3a+a−1

13a+a+1
Done

Answer 1

Number of adult passengers = a

number of adult passenger = 3 * number of children
⇒ a = 3 * number of children
⇒ number of children = 1/3 a

Total passenger = a + 1/3a + 1

hope it helps!

Answer 2

Its 3a+a+1

3a calculates the number of children
a calculates the adults
1 is the driver