Answer:
see below
Step-by-step explanation:
butterfly = x minutes
breast = y minutes
total is 50 minutes
breast stroke = butterfly +20
Part A
x+y = 50
y = x+20
Part B
Substitute the second equation into the first
x+ (x+20) = 50
2x+20 = 50
2x+20-20 = 50-20
2x = 30
2x/2 = 30/2
x = 15
y = x+20
y = 20+15
y = 35 minutes
35 minutes on the breast stroke
Part C
45 minutes on the butterfly is not reasonable
We only have a total of 50 minutes
50-45 = 5
But he spend more time on the breast stroke ( 20 minutes more), but if he spend 45 minutes on the butterfly, he would have to spend less on the breast stroke.
It would be: 0.25 = 25/100 = 1/4
so, your answer is 1/4
The answer is 11/4 or 2 3/4
Answer:
x =2
Step-by-step explanation:
14x - 10 = 3(4 + x)
Distribute
14x -10 = 12 +3x
Subtract 3x from each side
14x -10 -3x = 12+3x-3x
11x -10 = 12
Add 10 to each side
11x -10+10 = 12+10
11x = 22
Divide each side by 11
11x/11 =22/11
x =2
