Question

Apple costs rupees 7 each watermelon cost rupees 5 each if x spends Rs 38 on these fruits then find the no.of apples purchased by x

Answer 1

Number of apples purchased is 4.

1. As the given problem is a problem of linear equations one needs to have two equations to find the solution but in this particular question there is only one solution.
2. Let us form the equation first, let us consider the number of apples as x and the number of watermelons as y.
3. Given equation becomes : 7x + 5y = 38.
4. We can check here by substituting the values of x (number of apples) as 0,1,2,3,.... adn so on.

1. we check for x=0 in the equation, we get y in decimals which cannot be true.
2. Similarly for x=1,2,3 , we get y in decimals which cannot be true.
3. now for x=4, we get y as 2.
4. now for x=5, we get y in decimals which is false and for values greater than 5 we cannot compute as the value of y appears to be negative which even isn't true. so we stop here and the answer we get is x(number of apples)=4.