Answer:
The answer to your question is Katie had 15 rocks and Oliver 45 rocks.
Step-by-step explanation:
Conditions
Katie has x amount of rocks
Oliver has 3x amount of rocks
The final amount of rocks
Oliver = 3x + 75
Katie = x + 105
Now, they have the same amount of rocks, then we can equal both equations
3x + 75 = x + 105
Solve for x
3x - x = 105 - 75
2x = 30
x = 30/2
x = 15
Conclusions
At first Katie had 15 rocks and Oliver had 3(15) = 45 rocks
Hey there, Bulgogi!
The correct answer will be the first one since [I'm assuming] you know that to calculate the percentage of something, it's the amount of that something divided by the total amount but since only 30 students voted [12+18] multiplied by 100.
So, we are calculating the percentage on votes and 12 students voted for Candidate A so our Numerator will be 12 and our Denominator will be the total amount of student who voted, so 30 [or 12+18]
Once put into a fraction, we will get

which would be equals to 2/5 or 0.4. Now we multiply by 100 and we get a total of 40% for Candidate A.
Thank you for using Brainly.
See you soon!
Answer: 300
Step-by-step explanation: 300+200=500
then 500-200=300
Answer:Let's solve your equation step-by-step.
1
4
(2x+8)=−16
Step 1: Simplify both sides of the equation.
1
4
(2x+8)=−16
(
1
4
)(2x)+(
1
4
)(8)=−16(Distribute)
1
2
x+2=−16
Step 2: Subtract 2 from both sides.
1
2
x+2−2=−16−2
1
2
x=−18
Step 3: Multiply both sides by 2.
2*(
1
2
x)=(2)*(−18)
x=−36