Answer:
1)
Exchange `160cm = 1.6m`
The area of the square is `100m^2`
`=>` The side of the square is 10m because
`10 × 10 = 100`
The number of pieces of wire `160cm` long to take to wrap a square with an area of
`100 m^2` is : `10 : 1.6 = 6.25` ( paragraph )
Change `6.25 =` `6 1/4` paragraph
Answer: `6 1/4` paragraph
2)
The units digit has `3` choices (since it's an even number, the units digit can only be `0`, `2` or `4` )
Tens digit has `4` choices
Hundreds digit has `3` choices
The thousands digit has `1` choice
So it is possible to generate all even `4` digit numbers that are different:
`3 × 4 × 3 × 1 = 36` ( number )
Answer: `36` numbers