How many pieces?

Think about it in this way -

------------------------------- 0 cuts/1 piece/0 minutes

---------------|--------------- 1 cut/2 pieces/10 minutes

------|------------|----------- 2 cuts/3 pieces/20 minutes

If all three cuts are lengthwise then only the answer is right. But imagine the board is cut through the middle and again one of these pieces is cut breadth-wise then it comes to 15 minutes. There should be a bit more description regarding how the board is cut.

1 cut = 2 pieces, 2 cut = 3 pieces, 1 cut = 10 min, 2 cut = 10 *2 min = 20 min

cool question dude..................................

It took her 10 minutes to make one cut (2 pieces). It will take her 20 minutes to make 2 cuts (3 pieces).

Pieces-1*10=time

Need 1 cut to have 2 pieces, it takes 10 mins

Need 2 cut to have 3 pieces, it takes 10*2 = 20 mins

It's the number of cuts times 10... But I have a grievance against this problem: What if the second board is smaller? What if the second board is the same size, but the second cut is shorter because it had a small piece cut off?

Nice question man

The problem is If she works just as fast, that means that if she cuts with the same speed...

v⃗ =△x⃗ △t⃗

If Marie saw a board into 2 pieces in 10 minutes, that means 1 cut in 10 minutes (v⃗ =110 cuts per minute ).

So to perform 2 cuts to obtain 3 pieces, we have:

△t⃗ =△x⃗ v⃗ =2(110)=2×10=20

(Time for all Cuts) = (# of Cuts) * (Time for One Cut)

Y = X * Y1

Y = (2) * (10)

Y = 20 Minutes.

Or you could just USE YOUR FREAKING BRAIN! Idiots...

Notice that when Marie cuts a board into $n$ pieces, there are $n - 1$ cuts.

Therefore, from the question, $1$ cut ( $2$ pieces) takes $10$ minutes. $2$ cuts ( $3$ pieces) must then take $10 \times 2 = \boxed{20}$ minutes.

10 minutes = 2 pieces 0 minutes = 1 piece We can see that it takes Marie 10 minutes to add a piece. 10 + 10 = 10 x 2 = 20. It is 10 x 2 Because we want 3 pieces and it takes 10 minutes for a piece to add. You might think it's 30 then, Because 10 + 10 + 10 = 10 x 3 = 30. But it's not, Because we start already with 1 piece and it took no time for the first piece.

Conclusion: Marie can cut a board into 3 pieces in 20 minutes. So it equals 20 .

• Apply what you know about cutting something into pieces. Here, 2 pieces means 1 cut, so 3 pieces means 2 cut: N parts = N-1 cuts . It took 10 minutes for Marie to cut 1 piece, therefore it'll take 20 minutes to cut 2 times to get 3 pieces.

Cutting the same board along it's cross section has nothing to do with the size of the piece.

Each cut is 10 minutes and makes two board pieces. Making three cuts takes 20 minutes ( 10 minutes for each cut) and makes three board pieces.

First she can cut the board into pieces then she gets $1 \times 2=2$ pieces which will take $10$ minutes

Then she can cut one of the two pieces into $2$ which will take another $10$ minutes. Totally, time taken= $10+10=20$ minutes

---/-----/------- 2 cut needs 20 min

Think about it this way: If she takes 10 Minutes (she's so SLOW!) to break the board in half(you can't break the board in 1 peice,by the way,because that's how it starts off),then we can make an expression:

10 n : n ,being the number of times she cuts the board If she cuts the board twice,once in half and then cuts the board again: 10(1)+10(1)=10+10=20 Minutes!

since you can only cut a board in half regardless of the size of the board it would have to take 20 minutes. cutting one board in half takes 10 minutes. taking a half of the board which you cut and cutting that in half takes another 10 minutes. 10+10=20 :)

As 2 pieces require 10 minutes, then keeping 1 piece, take the other, then cut this, it will also takes 10 minutes, so total time requires 20 minutes.

well it does say that boards can only be cut in half so 1 cut 2 halves = 10 minutes then you cant acutaly create exactly 3 you create 4 but that is your awser

It takes 10 minutes to make a single cut for two pieces. And for 3 pieces it would require 2 cuts. So, 1 cut= 10mins Therefore 2 cuts= 20mins

In this problem its not about the number of pieces , its about the number of cuts.

She takes 10 minutes for 1 cut i.e. 2 pieces.

Thus if she works just as fast for cutting 3 pieces then she would take 20 minutes as she has to perform 2 cuts.

For one cut she takes 10 minutes and thus for 2 cuts i.e. 3 pieces she has to take double the time.

Thus she takes up 20 minutes.

her rate is = to 10 min per cut, thus to make 3 pcs. it need 2 cuts so 2x 10 = 20 minutes.