- A
- B
- C3
- D
Step-by-Step Solution
Fall = first reading − last reading = °C. A fall is a size, so the answer is positive — confuses the drop with the new reading. Adding the two temperatures instead gives , the "3" option.
Answer: A)
At 6 pm the temperature at a Manali weather post was °C, and by midnight it had dropped to °C. By how many degrees did the temperature fall?
Class 7Rational NumbersRational Numbers
Key idea: Operations on rationals
**Addition / subtraction**: same denominator → add/subtract numerators. Different denominator → bring to common denominator first.
**Multiplication**: (p/q) × (r/s) = (p×r)/(q×s). Sign rule from integers applies (same → +, different → −).
**Division**: multiply by the reciprocal. (p/q) ÷ (r/s) = (p/q) × (s/r), provided r ≠ 0.
Nothing new compared to fractions — just keep track of signs.
**Multiplication**: (p/q) × (r/s) = (p×r)/(q×s). Sign rule from integers applies (same → +, different → −).
**Division**: multiply by the reciprocal. (p/q) ÷ (r/s) = (p/q) × (s/r), provided r ≠ 0.
Nothing new compared to fractions — just keep track of signs.
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