Question

The sum of andre and brandons scores on a math quiz is 180. Andre score is 2 times as much as 30 less than brandons score. Find each students quiz score

Answer 1

Answer: Brandon's score x= 80

Andre's score=100

Explanation:

Let 'x' represents Brandon's score in math quiz.

Then, Andre's score =2(x-30)

Since, the sum of Andre and Brandon's scores on a math quiz is 180.

Then,
`x+2(x-30)=180`

`x+2x-60=180\\\\\Rightarrow3x=180+60\\\\\Rightarrow3x=240\\\\\Rightarrow x=80`

Therefore, Brandon's score x= 80

Andre's score
`=2(80-30)=2(50)=100`

Answer 2

To solve this word problem, we are going to write a system of equations, letting the variable a represent Andre's test score, and the variable b represent Brandon's test score.

We know that Andre and Brandon's combined test score is 180, or

a+b = 180

We also know that Andre's score is twice as much as 30 less than Brandon's score, or

2a = b - 30

Now, we just need to solve the system of equations by substitution, as this is the easiest method for this specific problem.

When simplified, a+b=180 equals a=180-b

Now, if we use this equation of a in substitution for the other equation, we will get our answer.

2(180-b) = b-30

When we use the distributive property to simplify the left side of the equation, we get:

360-2b=b-30

When we further reduce the equation by adding 2b to both sides of the equation, we get:

360 = 3b-30

Next, we have to add 30 to both sides to get the variable alone on the right side of the equation, resulting in the equation:

390=3b

Finally, we divide both sides by 3 to separate the coefficient from the variable b

130=b

Now, we have to substitute our solution for the variable b into the original equation.

a+b=180
a+130=180
a=50

Therefore, Brandon's test score was 130, and Andre's test score was 50.