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by Alfred
Thu Sep 03, 2015 12:05 am
Forum: Uncategorized
Topic: array fun
Replies: 2
Views: 23

Re: array fun

Whoops, forgot: I get 8.
Seems to be n^2 / 2
by Alfred
Wed Sep 02, 2015 6:42 pm
Forum: Uncategorized
Topic: array fun
Replies: 2
Views: 23

array fun

0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 You have a 4by4 array with all 16 squares at value 0. Pick any square: all the squares in the same row and column, including the square you picked, will change values: 0 becomes 1, and 1 becomes 0. What is the minimum number of picks to end up with: 0 1 0 1 1 0 1 0 0 ...
by Alfred
Mon Aug 31, 2015 3:57 pm
Forum: Beginning Algebra
Topic: When A,B and C work together, B does 4/15 of the work.
Replies: 2
Views: 23

Re: When A,B and C work together, B does 4/15 of the work.

Thanks Buddy. Happy to see your note "but it all cancels out!". This was happening to me too! This is the exact original problem: Working together B and C take 50% more number of days than A,B and C together take, and A and B working together take 8/3 more number of days than A,B and C tak...
by Alfred
Mon Aug 31, 2015 1:30 am
Forum: Beginning Algebra
Topic: When A,B and C work together, B does 4/15 of the work.
Replies: 2
Views: 23

When A,B and C work together, B does 4/15 of the work.

To complete a certain job, B and C (working together) take 50% more days than A, B, and C (working together); for example, if A+B+C take 10 days, then B+C take 15 days. When A, B, and C work together, B does 4/15 of the work. How long does it take to complete the job when A,B and C work together? Gi...
by Alfred
Fri Aug 07, 2015 12:45 am
Forum: Uncategorized
Topic: making cubes
Replies: 7
Views: 239

Re: making cubes

Thanks Shadow.
by Alfred
Thu Aug 06, 2015 4:19 pm
Forum: Uncategorized
Topic: making cubes
Replies: 7
Views: 239

Re: making cubes

Forget it; 333 is the solution!!!!!!!!!!!!!!!!
Found it at Sloane's integer sequences: sequence A000543
Thanks.

Hard to "picture" 333...need a couple Tylenols :)
by Alfred
Thu Aug 06, 2015 12:18 am
Forum: Uncategorized
Topic: making cubes
Replies: 7
Views: 239

Re: making cubes

Thanks Buddy.

My 27 is wrong.

Added information:

If a cube can be obtained by rotating another cube,
these two cubes are NOT considered to be different.

If there was only 2 colors, the answer would be 23.
by Alfred
Wed Aug 05, 2015 4:34 pm
Forum: Uncategorized
Topic: making cubes
Replies: 7
Views: 239

Re: making cubes

Sorry, forgot to mention I get 27 as answer.
Can anyone confirm? Thanks.
by Alfred
Wed Aug 05, 2015 4:10 pm
Forum: Uncategorized
Topic: making cubes
Replies: 7
Views: 239

making cubes

You have an unlimited supply of black, red and white unit (1x1x1) cubes.

Use any 8 of these cubes to create different 2x2x2 cubes.

What is the maximum number of these cubes that you can create?
by Alfred
Sun Jun 28, 2015 4:52 pm
Forum: Intermediate Algebra
Topic: Two equations with two unknowns
Replies: 2
Views: 316

Re: Two equations with two unknowns

Start with criss-cross multiplication.

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