Sunday Sums

[MichaelJH]

Hellen is 54 years old and her mother is 80, how many years ago was Hellen's mother three times her age?

[SheldonC]

If you've asked this one correctly!

41 years ago when they where 13 & 39

[MichaelJH Heart Star in reply to SheldonC]

Cheeky! Yes, you are correct! ⭐

[RufusScamp in reply to MichaelJH]

That's what I made it. Still struggling with the 8s.

[MichaelJH Heart Star in reply to RufusScamp]

Yes, it's a question off solving

80 - x = 3(54 - x)

The 8s problem has more than one solution.

[MountainGoat52]

I like these mental challenges. However there are some things that I was taught at school that I have never found a use for.... classically, who uses quadratic equations? Don't ask about differentiation as I never got what that was about. 😀 I'm now doing Nerdle on a regular basis to keep the grey cells going.... plus the usual word games.

[MichaelJH Heart Star in reply to MountainGoat52]

You can use Differentiation to work out the volume of a sphere from first principles. Various areas of mathematics cropped up in my last job when I analysed gait in humans and horses.

[MountainGoat52 in reply to MichaelJH]

Michael, you must be the first I've heard of using differentiation in their job. As an Architect all I used were sine, cosine and tangent tables and maybe the odd applied maths principle here and there..... much of which was superseded by CAD where you drew what you wanted and then asked the program for the information. 😀

[MichaelJH Heart Star]

Easiest solution is:

888 + 88 + 8 + 8 + 8 = 1000

Another way is:

((8×(8+8))-((8+8+8)/8))×8

There are other solutions as well...