A rectangle has an area of 36 inches squared. Write an equation to show how the length (l) varies inversely the width (w).
1 answer:
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Answer:
<em>(a) The system that models the situation: and
</em>
<em>(b) David needs 40 pounds of bread flour and 240 pounds of cake flour.</em>
Step-by-step explanation:
The amount of flour mixture is 280 lb. that is 8% plain flour.
So, the amount of plain flour in the mixture will be: lb.
The number of pounds of bread flour and cake flour needed to make the new mixture are and
respectively.
<u>So, the first equation will be</u>:
The bread flour has 14% plain flour and the cake flour has 7% plain flour.
Thus, the amount of plain flour in bread flour lb. and the amount of plain flour in cake flour
lb.
<u>So, the second equation will be</u>:
From equation (1), we will get:
Now substituting this into equation (2) in place of
........
Plugging this into equation (1), we will get.....
So, David needs 40 pounds of bread flour and 240 pounds of cake flour.