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by Alfred
Mon Feb 15, 2016 2:24 am
Forum: Beginning Algebra
Topic: If 5,a,b are multiplied to form the product 5ab then...
Replies: 6
Views: 667

Re: If 5,a,b are multiplied to form the product 5ab then...

If b=0, then 5ab = 0.
Do you mean "if b=1" ?
by Alfred
Sun Nov 29, 2015 7:45 pm
Forum: Uncategorized
Topic: Number puzzle
Replies: 0
Views: 1911

Number puzzle

Find the highest number where:

1: all digits are different

2: the sum of its digits is a 2digit number whose 2 digits do not appear in the number

Example:
number : 754
7 + 5 + 4 = 16 : 1 and 6 do not appear in 754
by Alfred
Thu Nov 05, 2015 12:58 am
Forum: Uncategorized
Topic: Tick tock!
Replies: 2
Views: 594

Re: Tick tock!

Thanks Maggie.

I knew the answer...put it up for people to try...
Spoiler:
1,11,708,719 = 1439


Those 2 sites only discuss the hour,minute.
A better site:
http://puzzling.stackexchange.com/quest ... on-a-clock
by Alfred
Wed Nov 04, 2015 7:51 pm
Forum: Uncategorized
Topic: Tick tock!
Replies: 2
Views: 594

Tick tock!

From Henry Dudeney to you: In a 12 hours period, starting exactly at 00.00, how often does: 1: the minute hand overlap the hour hand 2: the second hand overlap the hour hand 3: the second hand overlap the minute hand The clock works fine, so no tricks! Advertisement for clock repair shop: "If y...
by Alfred
Wed Nov 04, 2015 12:50 am
Forum: Uncategorized
Topic: 7,7,7,7
Replies: 4
Views: 606

Re: 7,7,7,7

Yes, I do. Here's a slightly different kind: Use digits 1,2,3,4,5 once each and in ASCENDING order. Allowed: brackets, concatenation, + - / * ^ ! ; NOTHING else! Here's from 1 to 100: 1: 1^2345 2: 1^23 - 4 + 5 3: 123 - 4! * 5 4: -1^234 + 5 5: 1^234 * 5 6: 1^234 + 5 7: 123 + 4 - 5! 8: (12 * 3 + 4) / ...
by Alfred
Tue Nov 03, 2015 4:26 am
Forum: Uncategorized
Topic: 7,7,7,7
Replies: 4
Views: 606

Re: 7,7,7,7

Well, decided to use "squared":
7squared + 7squared - 7/.7 = 88
by Alfred
Mon Nov 02, 2015 3:49 pm
Forum: Forum Rules & Guides
Topic: Log In
Replies: 1
Views: 1345

Log In

When I log in, I activate "remember me".

WHY is it that I still need to log in every day?
by Alfred
Fri Oct 30, 2015 5:08 pm
Forum: Uncategorized
Topic: Need a loan?
Replies: 0
Views: 1072

Need a loan?

I found this quite interesting: A loan of $3000 over 24 months is obtained. The rate will be 9% annual compounded monthly for the 1st year, then 12% annual compounded monthly for the 2nd year. What is the required monthly payment over the 24 months? Part 2: a = 3000, u = .09/12, v = .12/12, p = mont...
by Alfred
Fri Oct 30, 2015 3:17 am
Forum: Uncategorized
Topic: 7,7,7,7
Replies: 4
Views: 606

Re: 7,7,7,7

Got 93: SUM[SUM(7)] / 7 + SUM(7) + 7

88 seems impossible...

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