Answer:16.5
Step-by-step explanation:
15 times 10 percent=1.5, Add 1.5 to 15 =16.5
15% of x = 21
Set up proportions.
15/100 = 21/x
Cross multiply the numbers (15 by x, 21 by 100).
Divide 2100 by 15x to get x.
2100/15 = 140
X is 140.
He would travel 67 1/2 miles in an hour.
174/29 = 6 times the difference
17*6 = 102
12*6= 72
34*6 =204
15*6 = 90
so the answer is A