Ineed to match the weight of 285.
i can only use these numbers to match it. which numbers can i combine to get 285?
7kg
9 kg
25 kg
100kg
13 kg

   100 + 100 + 25 + 25 + 13 + 13 + 9

Step-by-step explanation:

There are 334 ways to do it. The answer shown above is shortest sum. Perhaps the longest is 6×9 + 33×7, for a total of 6 + 33 = 39 numbers.

Given the above sum, certain replacements can be made:

  13 + 13 + 9 = 7 + 7 + 7 + 7 + 7

  25 = 9 + 9 + 7

  25 + 25 = 13 + 9 + 7 + 7 + 7 + 7

  25 + 25 + 25 = 13 + 13 + 13 + 9 + 9 + 9 + 9

  100 = 25 + 25 + 25 + 25

These can be iterated to whatever depth or combination may tickle your fancy.

Answer with step-by-step explanation:

We need to match the weight of 285 using the following numbers only:

There are numerous ways to combine these weights to get a total weight of 285. Below are a few way listed:

a=-3456

b=-21/36

Step-by-step explanation:

(7/b)-36=(28/b)

(7/b)-(28/b)=36

7-28=36b

-21=36b

-21/36=b

Since you found one variable substitute it in to find the other variable

28/b=a/72

28/(-21/36)=a/72

28 * (36/-21)=a/72

-48=a/72

72* -48 = a

a=-3456

a=-3456

b=-21/36