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?
Answers
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 = 981
You can cancel out a factor of 9 on both sides
9 * ( 2X + 5Y ) = 9 * 109
2X + 5Y = 109
The above is the simplified equation.
Now, multiply 5 on both sides of the equation.
5 * ( 2X + 5Y ) = 5 * 109
10X + 25Y = 545
The above equation means : 10 Apples and 25 Mangoes cost Rs. 545.
That's the answer to your question ! Which is Rs 545