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Step-by-Step Solution
She starts at 3 and makes 3 equal jumps of to reach 18: . (Writing forgets that she did not start at 0.)
Answer: D)
Kiran hops along the number line from start to finish in equal jumps of length . Which equation fits the picture, and what is ?
Class 7Simple EquationsSimple Equations
Key idea: Translating word problems into equations
Three steps:
1. **Pick a variable** for the unknown ('let be the number of …').
2. **Translate the words into an equation** using the operations the problem describes.
3. **Solve and answer in the original units.**
Example: 'Three times a number plus 7 equals 22. Find the number.'
Let = the number. Equation: . Solve: .
Answer: the number is 5.
1. **Pick a variable** for the unknown ('let be the number of …').
2. **Translate the words into an equation** using the operations the problem describes.
3. **Solve and answer in the original units.**
Example: 'Three times a number plus 7 equals 22. Find the number.'
Let = the number. Equation: . Solve: .
Answer: the number is 5.
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