Question

Kartik wants to buy a pastel sheet for drawing, which is in the shape of a square of aside $6cm$. Then what amount does he have to pay to the shopkeeper if the cost $1c{m^2}$is Rs.$10$?
$A)Rs.600$
$B)Rs.620$
$C)Rs.700$
$D)$None of these

Answer 1

Hint: First, we have to define what the terms we need to solve the problem are.
Since Kartik needs to draw; he would like a pastel sheet, and the shape of the pastel sheets like a square with all sides are equal$6cm$. (trivially all sides of the squares are equal) he pays Rs.$10$ for $1c{m^2}$the pastel sheets to that shopkeeper.
Formula used:
Area of the square $ = {a^2}$
Where a is the side of the square

Complete step by step answer:
We just need to find the total amount that Kartik spent to buy that pastel sheets since we know the pastel sheets having four equal sides $6cm$. Hence there are total $6 \times 6$centimeters of the square shapes; (every four sides are equal and multiplied by six centimeters)
Hence solving this we get $36$centimeters in that pastel sheet. If Kartik spends the cost of $1$centimeter is Rs.$10$. That means one centimeter is at the cost of ten rupees, now converting one centimeter into twenty-four centimeter we get; $1cm \times 36cm = Rs.10 \times 36$(centimeter times is the centimeter square)
Thus, we get $Rs.360$is the amount that Kartik spends to buy the pastel sheet from the shopkeeper.
Since all other options like $A)Rs.600$,$B)Rs.620$,$C)Rs.700$ are wrong because Kartik only spends $Rs.360$ to buy that sheet, not like six hundred or above that;

Hence all options are eliminated we get $D)$None of these is the correct option.

Note:
Square has an equal side in all so that only we can easily multiply that$6 \times 6$; if some shapes like a rectangle it is hard to identify the common terms. Also, if the option $Rs.360$is in the given answers in MCQ, we just need to select that only; for this exceptional case like all options are eliminated we get that none of these answers are correct.