Ramit

Ramit bought 10 pens,8 pencils, and 4 books; pens were Rs.5 1/2 each, pencils were Rs.2 1/2 each and books were Rs. 11 1/2 each; how much did they cost together?

Correct answer:

x =  111 Rs

Step-by-step explanation:

$$\begin{gathered} p=5\frac{1}{2}=5+\frac{1}{2}=\frac{5\cdot 2+1}{2}=\frac{10+1}{2}=\frac{11}{2}=5.5\text{Rs} \\ n=2\frac{1}{2}=2+\frac{1}{2}=\frac{2\cdot 2+1}{2}=\frac{4+1}{2}=\frac{5}{2}=2.5\text{Rs} \\ b=11\frac{1}{2}=11+\frac{1}{2}=\frac{11\cdot 2+1}{2}=\frac{22+1}{2}=\frac{23}{2}=11.5\text{Rs} \\ x=10\cdot p+4\cdot n+4\cdot b=10\cdot \frac{11}{2}+4\cdot \frac{5}{2}+4\cdot \frac{23}{2}=111\text{Rs} \end{gathered}$$

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