- A16
- B20
- C21
- D22
Step-by-Step Solution
Shapes 1, 2, 3 use 4, 7, 10 sticks: each new square adds 3, so squares use forgets that squares share sides.)
Answer: C) 21
Count the matchsticks in Shapes 1, 2 and 3 and find the rule. A longer row of squares made the same way uses the number of matchsticks shown. How many squares are in that row?
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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