11 Plus Exams Forum

Here's the question:
Flo eats spaghetti every other day. She eats apple pie every three days.
Today is Tuesday. Yesterday, which was Monday, she ate both spaghetti and
apple pie. How many times during the next 60 days does she eat both spaghetti and apple pie?

My son answered it by writing out a table with the days of the week and just marking down every other day graphically etc. It seemed a very long winded way, but I wasn't able to advise him on another method.

Any ideas?! As you can tell, 11+ maths is not my forte
Also, can anyone suggest other similar questions that we can practice, and let me know what is the topic is called? Many thanks!

Spaghetti every 2 days, apple pie every 3. 2 and 3 are factors of 6. So spaghetti will be eaten on day 2,4,6 and apple pie on 3,6. They will be eaten together every 6 days, so you then work out how many 6s there are in 60, ie 10.

Lowest common multiple. See link for similar question.

http://www.elevenplusexams.co.uk/forum/ ... highlight=