heshamelaziry wrote:The Townville museum was open for 7 consecutive days. If the number of visitors each day was 3 greater than the previous day, how many visitors were there on the first day?

(1) There were a total of 126 visitors for the 7 days.

(2) The number of visitors on the seventh day was three times the number of visitors on the first day.

OA D

This question looks very familiar

Let x = # visitors on day 1
x+3 = # visitors on day 2
x+6 = # visitors on day 3
x+9 = # visitors on day 4
x+12 = # visitors on day 5
x+15 = # visitors on day 6
x+18 = # visitors on day 7

(1) sum of all 7 expressions above equals 126
i.e., (x)+(x+3)+(x+6) . . . +(x+18) = 126
We COULD solve this for x, so (1) is SUFFICIENT

(2) 3x = x+18
We COULD solve this for x, so (2) is SUFFICIENT

Answer: D