Question

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Answer 1

Answer: 90kg

Step-by-step explanation: weight of 12 chairs= 60kg

                                           => weight of one chair= 60/12

                                           => weight of one chair = 5kg

                                           => Therefore, weight of 18chairs = 18x5= 90kg

Answer 2

90 kg

Step-by-step explanation:

Given

Weight of 12 chairs = 60 kg

Weight of 1 chair = (60/12) kg = 5kg

Weight of 18 such chairs = 18*5 = 90 kg

Hence, weight of 18 chairs = 90kg