# Math Help - Problem Solving questions

1. ## Problem Solving questions

Hey

I got a couple of questions that I tried really hard to do but I still think it's wrong.

Here are the questions,

1. "If a single roll of wallpaper will cover 3 square meters, how many single rolls will it take to cover a wall 2 meters x 5 meters?"

2. "If a customer buys 2kg. of nails at 16cents a kg., how much would the nails cost?"

3. "If ceramic tiles are 203mm x 203mm, how many tiles would it take to cover an area 1 meters x 2 meters?"

Thanks.

2. Originally Posted by capo-status
Hey
...

1. "If a single roll of wallpaper will cover 3 square meters, how many single rolls will it take to cover a wall 2 meters x 5 meters?"
The wall has an area of 10m². To calculate the amount of rolls you must divide this area by $3 \frac{m^2}{roll}$ :
$\frac{10 m^2}{3 \frac{m^2}{roll}} = (3 +\frac13)\ rolls$

But you can't buy a $\frac13$ roll therefore you need 4 single rolls.

Originally Posted by capo-status
2. "If a customer buys 2kg. of nails at 16cents a kg., how much would the nails cost?"
If 1 kg of nails cost 16 cts. than 2 kg = 1 kg + 1 kg will cost 16 cts. + 16 cts. = 32 cts.

(By the way: Are you certain that you didn't know how to do this problem?)

Originally Posted by capo-status
3. "If ceramic tiles are 203mm x 203mm, how many tiles would it take to cover an area 1 meters x 2 meters?"
1. Calculate the area of one tile: $a = 203\ mm \cdot 203 \ mm = 41209\ mm^2$

2. Calculate the total area $A= 1000\ mm \cdot 2000 \ mm = 2,000,000\ mm^2$

3. Divide A by a to get the number of tiles. Be aware that you can't buy any fractions of tiles.