Alyssa took 100 photos on vacation. She wants to put them in a photo album with 30 pages. She can place 3 photos each on the first 10 pages. Then she can place 4 photos each on the next 10 pages. If she wants to put an equal number of photos on each of the remaining pages of the album, how many photos can she place on each page?
There are 3 x 10 = 
<gadget id="calculator">3*10</gadget>
<output>30</output>
30 photos in total that can be placed in the first 10 pages.
There are 4 x 10 = 
<gadget id="calculator">4*10</gadget>
<output>40</output>
40 photos in total that can be placed in the next 10 pages.
A total of 10 + 10 = 
<gadget id="calculator">10+10</gadget>
<output>20</output>
20 pages of the album have been used.
A total of 30 + 40 = 
<gadget id="calculator">30+40</gadget>
<output>70</output>
70 photos can be placed on those 20 pages.
So there are still 100 - 70 = 
<gadget id="calculator">100-70</gadget>
<output>30</output>
30 photos left to be placed on the album.
And there are 30 - 20 = 
<gadget id="calculator">30-20</gadget>
<output>10</output>
10 pages left in the album.
Therefore, 30/10 = 
<gadget id="calculator">30/10</gadget>
<output>3</output>
3 photos can be placed on each of the pages.

<result>3</result>