Please tell me what could be the right answer.Will drive for three days. Evey day he drives twice as many miles as the day before. After three days he has driven a total of 630 miles. How many miles did he drive on the first day?
A. 30 mi
B. 90 mi
C. 158 mi
D. 315 mi
I chose C. but it was wrong.
Let x be the number of miles travelled on the first day.
So he drove 2x miles the second day, and then 2(2x)=4x miles the third day.
So in 3 days, he travelled 630 miles, so it follows that x+2x+4x=630.
Ca you take it from here and solve for x?
EDIT: Jhevon is way too fast for me...haha...(inside joke)...
In addition to Jhevon's answer:
C: 158 mi on the first day - can't be the answer! Because of"Evey day he drives twice as many miles as the day before. So on the second day he drove 158*2 = 316
So after two days he drove 316+158 miles
On the third day he drove 316*2 = 632 miles
158+316+632 = 1106 miles
So D isn't correct either, because on the first day he drove more than 158 miles (and more than 630 miles in total)