Ex.3. A, B, C and D purchase a gift...
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Ex.3. A, B, C and D purchase a gift worth Rs. 60. A pays of what others are paying, В pays what others are paying and C pays of what others are paying. What is the amoung paid by D? (1) Rs. 16 (2) Rs. 13 (3) Rs. 14 (4) Rs. 15

11th - 12th Class
Maths
Solution
142
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Sol. (2) According to question, ( A+B+C+D=60 ) ( A=frac{B+C+D}{2} ) ( Rightarrow 3 A=60 Rightarrow A=R s .20 ) ( B=frac{A+C+D}{3} ) ( Rightarrow 4 B=60 Rightarrow B=R s .15 ) ( C=frac{A+B+D}{4} ) ( Rightarrow 5 mathrm{C}=60 Rightarrow mathrm{C}=mathrm{Rs} .12 ) ( D=60-(20+15+12) ) ( =60-47= ) Rs. 13
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