Question

Mary is organising a charity hot dog sale.

There are 18 bread rolls in each packet.
There are 15 hot dogs in each packet.
Mary buys exactly the same number of bread rolls as hot dogs.
What is the smallest number of each packet that Mary can buy?

Answer 1

5 packets of bread rolls and 6 packets of hotdogs.

Explanation:

18x=15y

6x=5y

x/y=5/6

18(5)=15(6)

Answer 2

11 packets both bread rolls and hotdogs. bread rolls 5 and hotdogs 6

Explanation:

So it's LCM.

18:15

90:90