-10+11= 1
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You would need to add water. The amount required is entirely dependent on how much volume you currently have. If the current volume is x then the question can be rewritten as: 10%x/(x+a) = 1% where a is the amount of water you need to add. Multiply both sides by x+a and you get 10%x = 1%x + 1%a Subtract 1%x from both sides and get 9%x = 1%a Divide by 1% and you get 9x = a Thus, to make a 1 percent solution from a 10 percent solution, you need to add 9 times the current volume of the solution in water.
You need to add 7 (or +7)
You add 10 to -7 to get 3.
1/5 + 1/5 + 1/10 need common denominator to add fractions; 10 looks good and 1/5 = 2/10 2/10 + 2/10 + 1/10 = 5/10 which is........... = 1/2
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