Math Drills
Elimination Problems
3Word Problems
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What this worksheet covers
- Worksheet
- Elimination Problems
The price of each single item is worked out from the prices of two ways of buying, in word problems. Five ways of eliminating are tried: subtracting straight where the counts match, doubling one expression before eliminating, producing both from a difference and a total, two expressions with different combinations in a set, and using the totals of each pair among three items.
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What gets doubled is the whole expression, so the count of items and the total price both grow by the same multiplier. A paper that doubled only the count of items and left the money on the right as it was has moved only one side within the single line it rewrote.
Crane and Turtle Problems went forward by supposing everything to be one kind, whereas here two expressions are set side by side and what they share is eliminated. One of those two comes in the form of an unchanging difference in years, in Age Problems.
- Subtracting Directly to Eliminate1 question
- Multiplying Then Eliminating1 question
- Using the Difference1 question
- Buying in Sets1 question
- Three Items1 question
Questions & answers
Problems and answers on this worksheet
These are the problems in “Various Word Problems”, shown with their answers.
(1)1 notebook and 2 books cost 380 dollars, and 1 notebook and 4 books cost 580 dollars. What is the price of 1 notebook and 1 book each? 1 notebook □ 1 book □
Answer: 180dollars, 100dollars
(2)1 backpack and 4 basketballs together cost 230 dollars. 2 backpacks and 3 basketballs together cost 260 dollars. How much do 1 backpack and 1 basketball each cost? 1 backpack □ 1 basketball □
Answer: 70dollars, 40dollars
(3)1 backpack costs 60 dollars more than 1 cap. Buying 1 backpack and 1 cap together costs 280 dollars. How much does each cost? 1 backpack □ 1 cap □
Answer: 170dollars, 110dollars
(4)1 set of A contains 2 backpacks and 3 caps for 370 dollars, and 1 set of B contains 3 backpacks and 1 cap for 380 dollars. How much do 1 backpack and 1 cap cost, each? 1 backpack □ 1 cap □
Answer: 110dollars, 50dollars
(5)1 water bottle and 1 backpack together cost 120 dollars. 1 backpack and 1 sneaker together cost 165 dollars. 1 sneaker and 1 water bottle together cost 155 dollars. How much does 1 of each of the 3 items cost? water bottle □ backpack □ sneaker □
Answer: 55dollars, 65dollars, 100dollars
What to do next
More worksheets in this unit
How Savings GrowHow Savings Grow Word Problems
Work-Rate ProblemsWork-Rate Problems Word Problems
Crane and Turtle ProblemsCrane and Turtle Problems Word Problems
Age ProblemsAge Problems Word Problems
Various Word Problems ReviewVarious Word Problems Review Word Problems (Work Rate, etc.)
Various Word Problems ReviewVarious Word Problems Review Word Problems (Age Problems, etc.)
