00:01
A computer is filling in an open entranceway with a door and two side panels of the same width.
00:06
That's the key bit, the same width.
00:08
The entranceway is three metres wide.
00:12
The door will be 1 .2 metres wide.
00:15
Okay, so let's fill out our information here.
00:16
So we've got a whole entranceway, and we're told that the whole thing is equal to 3, and that somewhere in here there needs to be a door that is equal to 1 .2.
00:31
And whatever this is, let's call it x, this is also going to be exactly the same.
00:37
Because as it said, the panels on either side are exactly the same.
00:41
How wide should the carpenter make a panel from either side of the door, so the two panels on the door will fit the entranceway exactly? well, let's look on the bottom here...