A bookshop had 60 boxes of pencils. Each box contained 85 pencils. Half of the pencils were packed into packets of 25 pencils and the rest were packed into packets of 20.

How many packets of pencils were there altogether?
My answer is 229 am i right?

How many pencils were left over?
My answer is 10, am i right?

60 * 85 = 5100

2550/25 = 102

2550/20 = 127 + 10 over

102 + 127 = 229

I guess you are right.

To find the number of packets of pencils, we need to determine how many packets of 25 pencils and packets of 20 pencils there are.

First, let's calculate the total number of pencils in the bookshop:

60 boxes * 85 pencils per box = 5100 pencils.

Next, let's find the number of pencils packed into packets of 25:

1/2 (half of the total pencils) * 5100 pencils = 2550 pencils.

To determine the number of packets of pencils, we divide the number of pencils by the number of pencils per packet for each type:

2550 pencils ÷ 25 pencils per packet = 102 packets of 25 pencils.

Now let's find the number of pencils packed into packets of 20:

5100 pencils - 2550 pencils = 2550 pencils.

To determine the number of packets of pencils, we divide the number of pencils by the number of pencils per packet:

2550 pencils ÷ 20 pencils per packet = 127.5 packets of 20 pencils.

Since you can't have half a packet, we need to round up to the nearest whole number. Therefore, there are a total of 128 packets of pencils packed into packets of 20.

Finally, let's check your answers:

The total number of packets of pencils is 102 + 128 = 230 packets.

It seems you were close with your answer, but you missed accounting for one packet of pencils.

To find the number of pencils left over, we subtract the total number of pencils packed into packets from the total number of pencils:

5100 pencils - (102 packets * 25 pencils per packet + 128 packets * 20 pencils per packet) = 5100 - (2550 + 2560) = 5100 - 5110 = -10.

It seems there are actually -10 pencils left over. This means there was an error in your calculation, as the number of pencils left over cannot be negative.

So, the correct answers are:
- There are 230 packets of pencils altogether.
- There are actually 10 pencils left over, not -10.

Please note that rounding conventions might differ depending on the problem and context.