please help with explination. this has alreay been answered by oobleck but i still dont understand.

Question

In one store, the ratio of DVDs to videos is 7:5. In another store, the ratio of DVDs to videos is 4:3. Explain why you cannot say which store has more DVDs.

Answer 1

ooblecks answer makes perfect sense to me

I will illustrate with an example
suppose in store1 there are 574 DVDs and and 410 videos
they are in the ratio of 574 : 410 = 7:5

suppose in store 2 there are 500 DVDs and 375 videos
they are in the ratio 500 : 375 = 4:3

clearly store1 has more DVDs

suppose store 1 sells some DVDs and videos and there are now
392 DVDs and 280 videos left.
but the ratio of 392 : 280 is still 7:5

Does it make sense now?

Answer 2

yes thank you reiny