Answer: There are 69 adults and 72 children went to the concert.
Step-by-step explanation:
Let x be the number of adults, and y be the number of children.
x + y = 141
3.5x + 2.5y = 421.5
x + y =141
x = 141 - y
3.5(141 - y) + 2.5y = 421.5
493.5 - 3.5y + 2.5y = 421.5
493.5 - y = 421.5
-y = -72
y = 72
x + y = 141
x + 72 = 141
x = 69
-1.7×-6 is the answer. Hope this helps.
The Earth is a watery place. But just how much water exists on, in, and above our planet? About 71 percent of the Earth's surface is water-covered, and the oceans<span> hold about 96.5 percent of all Earth's water. Water also exists in the air as </span>water vapor<span>, in </span>rivers<span> and </span>lakes<span>, in icecaps and </span>glaciers<span>, in the ground as soil moisture and in </span>aquifers<span>, and even in you and your dog.</span>
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The percentage of the people surveyed that were satisfied with the car is 45%.
<u>Given the following data:</u>
- Total population = 1,600 people
- Number of car owner = 720 people.
To determine the percentage of the people surveyed that were satisfied with the car:
<h3>
How to solve for a percentage.</h3>
In this exercise, you're required to calculate the percentage of the total population in this survey that would by a particular type of car again because they were satisfied with it. Thus, we would solve for the percentage as follows;

Substituting the given parameters into the formula, we have;

Percent = 45%
Read more on percentage here: brainly.com/question/14432715