Discussion
A vegetable seller was selling spinach for ₹ 60 per kg. Sonu purchased 350 g of spinach for which the vegetable seller took ₹ 21 (₹ 6 + ₹ 6 + ₹ 6 + ₹ 3) from Sonu. Which of the following statements is/are true regarding the mathematical skills used by the vegetable seller ?
A. This mathematical skill is ambiguous.
B. This skill is not useful to solve mathematical problems in class.
C. Such skills help in developing alternate strategies for solving mathematical problems.
Choose the correct option :
Answer: D
The correct option is only C.
The vegetable seller priced 350 g at the rate of ₹ 60 per kg by breaking it into convenient parts: 100 g costs ₹ 6, so three 100 g parts cost ₹ 18 and the remaining 50 g costs ₹ 3, a total of ₹ 21.
\[ \begin{aligned} 350\ \text{g} &= 100 + 100 + 100 + 50 \\ &= 6 + 6 + 6 + 3 = 21 \end{aligned} \]
The method is correct and exact, so it is not ambiguous (A is false). Such everyday strategies of decomposing numbers are valuable in class, so B is false too. They show that problems can be solved in different ways, which is exactly statement C.
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