tenoi14
18.10.2021 •
Mathematics
Mike built 1/2 of his tree house on Saturday. He completed another 1/4 on Sunday. How much of the tree house was left to build?
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Ответ:
1 : 4
Step-by-step explanation:
For a problem of this nature, a simple diagram makes the solution trivially easy. In the attached, the constituent concentrations are listed on the left, the solution concentration is in the middle, and the numbers on the right are the differences along the diagonals. These are the ratios of the respective solutions on the left.
That is, the ratio of 30% solution to 5% solution is 5 : 20 or 1 : 4.