## Welcome to H3 Maths

Blog Support for Growing Mathematicians

## Posts tagged with boat across river

### Puzzle Time again!

October24

Five members of the School Math team are running late for a big competition and hurrying toward the Hall—but they have to cross the stream that cuts through the campus. When they reach the stream, there’s a small boat tied up on their side that they can “borrow” to get to the other side. The […]

by posted under Uncategorized | tagged under , , , ,  |  Comments Off on Puzzle Time again!

#### Post Support

NCEA Level 2 Algebra Problem. Using the information given, the shaded area = 9, that is:
y(y-8) = 9 –> y.y – 8y – 9 =0
–> (y-9)(y+1) = 0, therefore y = 9 (can’t have a distance of – 1 for the other solution for y)
Using the top and bottom of the rectangle,
x = (y-8)(y+2) = (9-8)(9+2) = 11
but, the left side = (x-4) = 11-4 = 7, but rhs = y+? = 9+?, which is greater than the value of the opp. side??
[I think that the left had side was a mistake and should have read (x+4)?]