Jessica reads 30 pages of her book on the first day. The next day, she reads another 36 pages. On the third day, she reads another 42 pages. If she continues to increase the number of pages she reads each day by 6, how many days will it take her to read a book that has 270 pages?
Nguyễn Mạnh Hùng 17/06 at 01:28
Oh, sorry, the answer of the exercise is 10 not 9. Sorry ^^
Nguyễn Mạnh Hùng 17/06 at 01:13
30 is a multiple of 6; \(30=6\times5\)
If she continues to increase the number of pages she reads each by 6, so 36 is also a multiple of 6; \(36=6\times6\)
So the sum of all the page she read is:
We also have: \(270=6\times45\)
So the day she needs to read that book is 9 days
Wilhelmina went to the store to buy a few groceries. When she paid for the groceries with a $20 bill, she correctly received $4.63 back in change. How much did the groceries cost?