He went down 6 floors total.
3 floors down + 3 floors down = 6 floors down
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16.8 months
7.2 months
12.0 months
<span>1.4 months
</span>the ratio of cash to monthly cash expenses is 16.8 months
When the concentration of a solution is expressed in weight percentages, that is just equal to the mass of solute over the mass of the total solution. For a solution weighing 210 grams, 5% of it is salt. That is equal to
210*0.05= 10.5 g salt
The rest of the amount, determined by difference, is the amount of solvent which is water.
water = 210-10.5 = 199.5 g salt
To solve for the new concentration, you add up 15 g to the already existing 10.5 g of salt in the solution. The water, on the other hand, remains constant.
Concentration = (15+10.5)/(210+15) = 0.1133 or 11.33%
Answer:
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wait, are you sure thats the question
