A student 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?
+1
Answers (1)
Know the Answer?
Not Sure About the Answer?
Get an answer to your question ✅ “A student solved this problem by working backward. Tom had some marbles. He had three times as many marbles as Ralph. Ralph had 6 marbles. ...” in 📙 Mathematics if there is no answer or all answers are wrong, use a search bar and try to find the answer among similar questions.
Home » Mathematics » A student 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.