Answer:
let y=the inner missing angle
y+x+31=180
y+(2x-8)=180
and combine the two
2x-8-x-31=0
x=39
Step-by-step explanation:
Answer: 56
Step-by-step explanation: 100 multiplied by 50% is 50 + 12% =56
Answer:0.75
Step-by-step explanation:
Answer
28 minutes or 7/15 of an hour
Step-by-step explanation:
We know that Rate*Time = Distance. Because we are given distance and rate, we can easily change the equation to Distance/Rate = Time.
7/8 / 1 7/8 =
7/8 / 15/8 =
7/8 * 8/15 =
7/15 hour
7/15 * 60 = 28 minutes
Let’s say the first class is X.
Avg(X)= x/20=15
X=300
Let’s say the second class is Y.
Avg(Y)= Y/30=20
Y=600
X+Y=900
AVG(X+Y)=900/(20+30)=900/50=18
The average of both classes is 18.