Atextbook store sold a combined total of 475 physics and math textbooks in a week. the number of math textbooks sold was 61 less than the number of physics textbooks sold. how many textbooks of each type were sold?

add all the numbers and check the ones place.

the answer is 486. as the ones place is more than 4, the estimation will be the next 10 ie, 490

(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

hope i