Anonymous
Anonymous asked in Education & ReferenceHomework Help · 1 decade ago

Can someone help me with these math problem?

The vertices of a cube are each labelled with one of the intergers 1,2,3,...8. a face-sum is the sum of the labels of he four vertices on a face of the cube. What is the maximum number of equal face-sums in any of these labelling

A 5cm by 5cm by 4cm block is built from one hundred 1cm x 1cm x 1cm vubes, each of which is coloured red or white. Te cubes are arranged in such way that no two cubes touch along a face are the same colour. What is the number of red faces in the interor of the block and why?

It is suprising fact that 1 x 2 x 3 x 4 x 5 x 6 = 8 x 9 x 10. It is even more suprising that 8 x 9 x10 x 11 x12 x 13 x 14 is equal to another such product of consecutive whole numbers. What is the smallest number in this other product and why?

Gina has three children and one of them is a teenager. When she multiplies their ages the result is 770. How old is the teenager and why?

How many different pairs of 2-digit numbers multiply to give a 3-digit number with all digits the same

Update:

this is year 8 work....

10 Answers

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  • 1 decade ago
    Favourite answer

    I've got correct answers for all five of the questions, but you said you wanted "help" with the problems, so I'll provide hints.

    1 You don't even have to try any arrangement of numbers to know what the correct answer is.

    2 how many blocks are in the interior? There's only one way , due to symmetry, that the blocks can be arranged such that no to touching faces are the same color.

    3 which numbers in the second series are prime numbers?

    4 a teenager is between what ages? the age of every kid is a whole number. when you multiply whole numbers you never get decimal places.

    5. 111 is a multiple of ? all the three digit numbers are multiples of 111

    If you want answers scroll down

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    1 a cube has six faces. Every vertex is used by three faces. the sum of all the numbers 1 thru 18 is 36. multiply 36x3 (the number of times each number is used for all the faces in the cube). Divide by the 6 number of faces and you get 18. The vertexes can be numbered such that every face sum=18. One solution looking down at the cube and starting with the lower left corner and moving clockwise the top face 1,4,6,7 the bottom face 8,5,3,2

    2 a 3-d checkerboard pattern is the only way to arrange the blocks. The interior is (5-2)x(5-2)x(4-2) blocks in size or 3x3x2 = 18 half are red = 9

    3 8x9x10x11x12x13x14 both 11 and 13 are prime numbers in order to get the same product in a higher series of whole numbers whole number multiples of both prime numbers have to be in the product. first multiply the first series 8 x 9 x 10 x 11 x 12 x 13 x 14 = 17297280. the smallest possibility is 22 (2 x 11) thru 26 (2 x 13) then 26 thru 33 then 33 thru 39 and so on. Start dividing the numbers in sequence on a calculator into 17297280. you'll find that when you get to 65 thru 66 you're left with a whole number 4032. 67 won't work, but 65 will and then your left with 64.

    4 just divide 770 by each number 13 thru 19 and you'll find that only 14 divides into 770 evenly. your left with 55 which is obviously divisible by 11 and 5

    5 111 is a multiple of the prime number 37 you can easily find the prime factorization of all the three digit numbers keeping in mind that they are all multiples of 111.

    111 = 3 x 37

    222 = 2 x (3 x 37)

    333 = 3 x (3 x 37)

    444 = 4 x (3 x 37) = 2 x 2 x (3 x 37) gives you the first pair 12,37

    555 = 5 x (3 x 37) 15,37

    666 = 3 x 2 x (3 x 37) 18,37

    21,37

    24,37

    27,37

    6 pairs

  • 1 decade ago

    6

    half the cubes are red.

    11 10 7

    111 222 333 444 555 666 777 888 999 (to much work)

  • diane
    Lv 4
    1 decade ago

    part one answer

    as a member of a polically correct society I refuse to label any face.

    part two answer

    all the red blocks have red faces in the interior of the block because they were not painted white before being placed in the structure

    Part three answer

    the lowest number used in the other product would be the smallest number why simple logic

    Part four answer

    my guess would be the correct answer would be the one you are looking for

  • 1 decade ago

    Gina has three children and one of them is a teenager. When she multiplies their ages the result is 770. How old is the teenager and why?

    14

    Because that is the only number you can divide into 770 without getting a remainder

    ..Sorry I can't answer the rest. It's late and I'm tired

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  • Anonymous
    1 decade ago

    OH God...my head! Stooop! Owwieee. Why did I read this question about math..musta been morbid curiosity. Good luck..I'm sure you are so smart you really already have the answers and are just trying to torture us poor math challenged idiots. How mean! LOL..juss kidding. Love in Christ, ~J~ <><

  • 1 decade ago

    hey baby... u shud do ur homework urself..... otherwise teacher will throw o\u outta the class.... ha ha ha ha...... Silly

  • Anonymous
    1 decade ago

    was tat ure homework

  • Anonymous
    1 decade ago

    I am going to do

  • 1 decade ago

    hell for that homework

    hell for the teacher

    and hell for math

  • 1 decade ago

    oh! boy this is which standard maths??

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