A random sample of students was surveyed and asked to list their grade level and whether or not they have a pet. The total number of no pets would be 42.
What is addition?
The addition is one of the mathematical operations. The addition of two numbers results in the total amount of the combined value.
A random sample of students was surveyed and asked to list their grade level and whether or not they have a pet.
The total number of pets is 48.
Let a number of a pet in 6th grade be x.
So, [tex]x + 12 + 19 = 48\\\\x = 48 -31\\\\x =17[/tex]
The number of no pets in 6th grade
17 + y = 30
y = 13
The number of no pets in 7th grade
12 + z = 23
z = 11
The total result of survey in 8th grade
30 + 23 + a = 90
a = 37
The number of no pets in 8th grade
19 + b = 37
b = 18
The total number of no pets would be 42.
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