Chain Rule

Q 1: If the cost of A meteres of wire is X rupees, then what is the cost of B meteres of wire at the same rate? A)Rs. (AX) B)Rs. (XB/A) C)Rs. (XX/B) D)None of these Answer : Option Explanation: Cost of A metres = Rs.X Cost of 1 metre=Rs.(X/A) Cost of B metres=Rs.[(X/A)xB]=Rs.(XB/A) In a camp, there is a meal for 210 men or 300 children. If 210 children have taken the meal, how many men will be catered to with remaining meal? A)63men B)50men C)70men D)None of these Answer : Option A Explanation: There is a meal for 300 children. 210 children have taken the meal. Remaining meal is to be catered to 90 children. Now, 300 children= 210 men. 90 children= (210/300)x90=63men. Q 3: If the price of 23 dolls is 276, then what will the price of 12 dolls ? A)124 B)156 C)144 D)123 Answer : Option C Explanation: Less dolls, Less Price (Direct Proportion) So, let the price be Rs. x then, 23:12::276:x =>x=(276∗12)/23 =>x=144 Q 4: If a quarter kg of onion costs 60 paise, how many paise will 200gm cost ? A)48 paise B)40 paise C)38 paise D)45 paise Answer : Option A Explanation: Quarter of Kg means 250 gm Less weight, less price (Direct Proportion) So, 250:200=60:x x=(200x60)/250=48 paise

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