2. 2 5/12
4. 1 1/6
5. 1 1/2
6. 1 1/12
7. 1 5/12
8. 1 1/2
9. 1 7/12
10. 1 5/8
Answer:
5
Step-by-step explanation:
The greatest common factor of two numbers, one of which is 1, will always be 1.
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%
