Question

Rohan spends ₹ $x$ daily and saves ₹ $y$ per week. What is his income for $3$ weeks?

Answer 1

Amount of money spend in 1 day = ₹ $x$
So, amount of money spend in 7 days = ₹ $7x$
⇒ Amount of money spend in 1 week = ₹ $7x$
Amount of money saved in 1 week = ₹ $y$
∴ Income in 1 week = ₹ $\left(7x+y\right)$
So, income in 3 weeks = $3\left(7x+y\right)$
= ₹ $(21x+3y)$

Hence, income in 3 weeks = ₹ $(21x+3y)$.