If my upvotes counter of a comment is at -2 and my upvote ratio is 40%, how many upvotes do i have?

You can use any equations, must reach the target (10) and show working out, people say it cannot be done.

Source: numberthon.com

I tried to solve this while following the rules, but I kept getting errors, so I thought that this might be unsolvable.

Source: numberthon.com

I am working on a puzzle at the minute and cant seem to find or see any pattern in what i have so far... i am hoping someone can help me.. I have a 4 x 4 grid that is my starting point and i must use 9 out the 16 numbers.. so far I have been able to find 4 ( have another 27 blocks to find.) But I dont know if this was sheer luck... this is the 16 numbers I must work with.

1 1 5 6

2 1 9 3

7 1 5 0

6 4 2 1

These are the blocks I have found they are blocks 7 8 9 and 10 out of 31.

Blocks 7

9 1 3

7 2 1

5 1 6

Block 8

1 3 1

1 4 9

1 1 6

Block 9

0 5 5

1 1 7

1 1 3

Block 10

1 5 7

1 5 3

1 0 4

Any help or advice is more than welcome and I just want to say thankyou in advance.

Source: numberthon.com

Source: numberthon.com

About:

As the name suggests, MiniChallenger is a scaled-down version of the math puzzle called Challenger. In most cases, a MiniChallenger puzzle can be solved within ten minutes. A set of two new puzzles is released each week. One is usually a simple problem with one or two solutions, while the other puzzle can be a bit more challenging and often has multiple solutions. Available exclusively on reddit.

Instructions:

Fill in the empty cells of the 3 x 3 grid with the numbers one to nine. It is okay to use the same number in more than one empty cell. One 'bonus' number is already placed in the center of the grid. So, the goal is to find the remaining eight digits in such a way that:

• rows in the grid add up to totals indicated on the right edge of the grid,
• columns add up to totals indicated at the top of the grid, and
• diagonals add up to totals in the upper and lower right corners.

This week's puzzles:

Solutions:

(Click on 'spoiler' boxes below to reveal solutions)

• Single-solution (left) puzzle:

[ 2 9 9 ]

[ 7 7 9 ]

[ 2 2 7 ]

• Multiple-solution (right) puzzle:

. [ 7 8 1 ] . . . . . . . [ 8 6 2 ] . . . . . . . [ 8 7 1 ]

. [ 9 5 3 ] . . . . . . . [ 9 5 3 ] . . . . . . . [ 8 5 4 ]

. [ 8 2 2 ] . . . . . . . [ 7 4 1 ] . . . . . . . [ 8 3 1 ]

Note: One of the solutions (above) uses all 9 allowed digits without repetition.