1.

A road has 349 houses on it numbered from 1 to 349.
The diagram shows some of these houses.
The houses on the West side of the road have odd numbers.
The houses on the East side have even numbers.

Tomaz delivers a leaflet to every house on the West side of the road.
He starts at house number 1 and then delivers to each house in order.

i) Find an expression, in terms of $n$, for the house number of the $n$th house he delivers to.

[2]

ii) Work out the house number of the 40th house he delivers to.

[1]

iii) Work out how many houses are on the West side of the road.

[2]