HKIMO 2017 Grade 6 National Final (Heat) Set 04 Question 4

Amy reads 1 page on day 1, 2 pages on day 2, 3 pages on day 3, and so on. She stops when the total number of pages read is first a multiple of 60. How many pages has she read?

Source glossary (English–Vietnamese): Total: tổng số; Multiple: bội; Until then: đến lúc đó.