- A3
- B6
- C12
- D
Step-by-Step Solution
Number of covers = . Multiplying instead of dividing gives , which is not even a whole number of covers, and dividing only the numerators (27 ÷ 9) gives 3 while ignoring the denominators completely.
Answer: B) 6
A tailor in Surat has metres of cloth and needs metre of it for each cushion cover. How many cushion covers can he make?
Class 7Rational NumbersRational Numbers
Key idea: Standard form (simplest form)
To put a rational number in standard form:
1. If the denominator is negative, multiply both top and bottom by −1 to make it positive.
2. Divide top and bottom by their GCD.
Example: −12/−18. Make denominator positive: 12/18. GCD = 6. Divide: 2/3.
Example: 15/−20. Make denominator positive: −15/20. GCD = 5. Divide: −3/4.
1. If the denominator is negative, multiply both top and bottom by −1 to make it positive.
2. Divide top and bottom by their GCD.
Example: −12/−18. Make denominator positive: 12/18. GCD = 6. Divide: 2/3.
Example: 15/−20. Make denominator positive: −15/20. GCD = 5. Divide: −3/4.
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