Mathematics, 20.08.2019 02:40 gunnatvinson

Astudent solved this problem by working backward.
tom had some marbles. he had three times as many marbles as ralph. ralph had 6 marbles. tom lost 3 marbles and bought 6 new marbles. how many marbles does tom have now?
student's solution - ralph has 6 marbles, so tom has 6 × 3 marbles to begin with. so tom has 18 marbles. he lost 3, so 18 – 3 = 15, and bought 6, so 15 + 6 = 21. so tom now has 21 marbles.
here is a problem that can also be solved by working backward.
alex bought twice as many pears as apples. he bought 4 more pears than oranges. he bought 6 apples.
how many oranges did alex buy?

Answers: 1

Show answers

Another question on Mathematics

Mathematics, 21.06.2019 14:10

Rachel reads 1/5 of the pages of a book plus 12 pages on the first day. on the second day, she reads 1/4 of the remaining pages plus 15 pages. on the third day, she reads 1/3 of the remaining pages plus 18 pages. on the fourth day, she reads the remaining 70 pages. how many total pages are in the book?

Answers: 2

Answer

Mathematics, 21.06.2019 21:30

Madeline takes her family on a boat ride. going through york canal, she drives 6 miles in 10 minutes. later on as she crosses stover lake, she drives 30 minutes at the same average speed. which statement about the distances is true?

Answers: 3

Answer

Mathematics, 21.06.2019 22:00

Rewrite so the subject can be y in the formula d=m-y/y+n

Answers: 1

Answer

Mathematics, 22.06.2019 02:30

Given right triangle abc, what is the value of tan(a)?

Answers: 1

Answer

You know the right answer?

Astudent solved this problem by working backward.
tom had some marbles. he had three times as...