The Maths Thread

[East Level 2]

A, b, and c are three prime numbers such that a×b×c= 17x(a+b+c). What is the value of a, b and c?

2, 17 and 19

 

[Paladin]

2, 17 and 19

Yup. I like to set these problems for my son, who is in Y2 Maths at MMU. This one took him five minutes.

 

[Fiftyyearsandcounting]

Get kids to put 99999999.9 into their calculator and divide by 3 to get 33333333.3. Divide by 3 again and get 11111111.1. Divide once more and you get a random number but divide that by 3 and you get 12345678.9
They think its magic.
(I hope l got the right number of digits each time. I am going sken eyed trying to count them.
L


.

Isn't the 8 missing?

 

[East Level 2]

Yup. I like to set these problems for my son, who is in Y2 Maths at MMU. This one took him five minutes.

It was obvious one of the numbers was 17 and comparing two tables, 17*(17+a+b) and 17*a*b, in Excel did the rest.

 

[Mike Cledford]

Isn't the 8 missing?

Was doing it from memory as I didnt have a calculator to hand to confirm but i think it was done by pressing all the nines on a standard calculator until the display was full and doing the division from there. Some calculators were different because of the way they rounded up digits at the end.
Four in the morning and cant sleep. Perhaps l need a calculator to count sheep;)

 

[Paladin]

Here's a nice little puzzle for you mathematicians.

Just to clarify the rules, you have to fill in as per normal Sudoku. Same number cannot be in an adjoining square (King's move in chess) or a chess Knight's move away. Also, consecutive number can't be in the next square up, down or sideways, but can be adjacent diagonally.

I solved it in three hours yesterday, with a couple of false starts whilst understanding the rules. I used Excel as an aid.

This link might help. https://cracking-the-cryptic.web.app/sudoku/897LqtfTQD

 

[BlueMoonRisin’]

X= ?

 

[MCFC_ Phil]

Can someone tell what digits you need to put boobless into the calculator?

 

[LWashington]

 

[TheRemainsOfTheDave]

Can someone tell what digits you need to put boobless into the calculator?

You can use any fingers you want.