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Saturday 7 December, 2019

# MATHS WEEK: The answer to Saturday's puzzle

## Did you get it?

Image: AP/Press Association Images

HERE IS THE answer to yesterday’s Irish Water puzzle.

The question was:

A certain street is comprised of houses all with two adult minimum occupancy. Only 60% of houses pay their water charge which is €260 each. All houses have collected their Water Conservation Grant which is €100. The net collected from the street is €4,648. How many houses are on the street?

83 houses

Method

One way to do it is- 60% of houses pay the grant that’s (60/100)*260 = 156 average payment per house

100% of houses claim the grant – that’s 100 claimed per house.

There is then €56 Net per house paid.

There is €4,648 Net paid overall so there are 4648/56 = 83 houses.