Question

If the cost of one cake is ₹5, then what is the cost of 10 cakes?

• A. ₹5
• B. ₹10
• C. ₹25
• D. ₹50

Answer 1

The correct option is D ₹50

Given: Cost of one cake = ₹5
To find: Cost of 10 cakes.

$\text{Here, Cost}\left(x\right)\propto \text{Quantity}\left(y\right)$

So,
$\frac{x_1}{y_1}=\frac{x_2}{y_2}$

$\text{Given,}{x}_1=1,y_1=5,x_2=10$
$\text{To find :}{y}_2$

$\frac{1}{5}=\frac{10}{y_2}$

$y_2=10\times 5=50$

Hence, cost of 10 cakes = ₹50