write an algebraic expression :- The cost of an apple is ₹x but you have only ₹3 with you. How many more rupees will you need to buy the apple?

write an algebraic expression :- The cost of an apple is ₹x but you

1.	write an algebraic expression :- The cost of an apple is ₹x but you have only ₹3 with you. How many more rupees will you need to buy the apple?
Answer» This is just Algebra basically. INITIALLY you might think you need two equations to solve such a problem ( as it has two variables ), by just looking at the statement. I thought the same. But I will show you that you don't need two equations to solve this question, since the question is designed in that manner. Let me you WALK through the solution.The question says :18 Apples and 45 Mangoes cost Rs. 981.Now, let X be one apple's cost, and Y be one mango's cost. Form an equation with this.18X + 45Y = 981You can cancel out a FACTOR of 9 on both sides9 * ( 2X + 5Y ) = 9 * 1092X + 5Y = 109The above is the simplified equation.Now, multiply 5 on both sides of the equation.5 * ( 2X + 5Y ) = 5 * 10910X + 25Y = 545The above equation means : 10 Apples and 25 Mangoes cost Rs. 545.That's the answer to your question ! Which is Rs 545