Ella mows lawns in her neighborhood during the summer. If she gets paid $15 per lawn, how many lawns does she have to mow to ear
2 answers:
Answer: Ella has to mow 40 lawns.
Step-by-step explanation: Given that Ella mows lawns in her neighborhood during the summer and gets paid $15 per lawn.
We are to find the number of lawns that she has to mow to earn her goal amount of $600.
Let n represents the required number of lawns.
Then, according to the given information, we have
Thus, Ella has to mow 40 lawns.
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Answer:
20 gallons of the 40% solution, 60 gallons of the 80% solution
Step-by-step explanation:
Let x = the gallons of the 40% solution, and y = the gallons of a 80% solution. The first thing we want to do here is to convert each percentage into decimal form - including the 70% solution mixture.
40% = 0.40,
80% = 0.80, respectively 70% = 0.70
As you can tell, 0.40 is associated with x gallons, 0.80 is associated with y gallons, and the mixture contains 0.70 80 solution, as 0.70 is associated with 80. Therefore we can formulate the following expression,
0.40x + 0.80y = 0.70 80
At the same time x + y = 80, as the solution ( mixture ) is present with 80 gallons. Isolating x, x = 80 - y. Let us plug that into our expression, solving for y, following by x gallons.
( Multiply either side by 10 )
( Expand )
( Substitute to solve for x )
As you can see there are 20 gallons of the 40% solution, and 60 gallons of the 80% solution.