Fifty pounds of a cement-and-sand mixture is 40% sand.

How many pounds of sand must be added for the resulting mixture to be 60% sand?

To get the answer you would have to multiply fifty by .4 to get 20. now you know that 20 is 2/5 of the bad and 1/5 must be 10. So you would multiply 10 by 3 to get to 3/5 so you can have 60%. The final answer is 30

Answered by MathG33k | 2024-06-10

To make the cement-and-sand mixture 60% sand, you need to first calculate the initial amount of sand, which is 20 pounds. Then, by solving the equation for the new percentage, you find that 25 pounds of sand must be added to the mixture. Thus, the final answer is to add 25 pounds of sand.
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Answered by MathG33k | 2024-10-09