If the cost of $6$ mangoes is $\text{₹}90$, what is the cost of $10$ mangoes?

We can solve this using the unitary method:
Given:

$$\text{Cost of }6\text{ mangoes}=\text{₹}90$$

Therefore, the cost of $1$ mango is:

$$\text{Cost of }1\text{ mango}=\frac{90}{6}=\text{₹}15$$

Now, we need to find the cost of $10$ mangoes:

$$\text{Cost of }10\text{ mangoes}=15\times 10=\text{₹}150$$