Posted by iris on Wednesday, October 26, 2011 at 2:56pm.
peter took a 1,500 mile trip in 5 days. each day, he drove 30 miles more than the day before. how many miles did he cover on the first day?

math  Reiny, Wednesday, October 26, 2011 at 4:16pm
You have an arithmetic series,
where d = 30 , and Sum(5) = 1500 , a is first term
sum(n) = (n/2)(2a + (n1)d)
1500 = (5/2)(2a + 120)
600 = 2a+120
2a=480
a = 240
On the first day he went 240 miles
check: 240 + 270 + 300 + 330 + 360 = 1500
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