This is a decrease of 68 - 42.5
------------ = 0.375 = 37.5% decrease
68
3x-6+10x+15=35
10x+3x=35-15+6
13x=26
x=2
Answer:
D.
Step-by-step explanation:
The sides correspond with a favor of 1.5
12/8 = 1.5
7.5/5 = 1.5
3/2=1.5
6 = equal or more than 6
thus each day kathy swims ≥ 6 laps
105/30=3.5 miles a minute
1 1/4 hours =75 minutes
3.5 * 75= 262.5 miles in 1 1/4 hours