Systems word problems: one number is a multiple of another
Write two equations for the two unknown numbers, then solve the system.
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One number is 3 times another number. Their sum is 80. What are the numbers? Write the smaller first, like (3, 12).
Answer: (20, 60)
One number is 4 times another number. Their sum is 100. What are the numbers? Write the smaller first, like (3, 12).
Answer: (20, 80)
One number is 5 times another number. Their sum is 12. What are the numbers? Write the smaller first, like (3, 12).
Answer: (2, 10)
Tip: Write two equations for the two unknown numbers, then solve the system.
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