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The cost of 2 oranges and 3 apples is ₹ 28. If cost of
apple is doubled then cost of 3 oranges and 5 apples is ₹
75. The original cost of 7 oranges & 4 apples (in (₹)) is:
Q117. Solution of 2푦 − 5푧 + 4 = 0 & 2푦 + 푧 − 8 = 0 will be?
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The cost of 2 oranges and 3 apples is ₹ 28. If cost of apple is double...
Cost Calculation for Fruits
To determine the original cost of 7 oranges and 4 apples, we can set up a system of equations based on the information provided.

1. Setting up the equations
- Let the cost of one orange be \( x \) and the cost of one apple be \( y \).
From the first statement:
- \( 2x + 3y = 28 \) (Equation 1)
From the second statement, where the cost of apples is doubled (let the new cost be \( 2y \)):
- \( 3x + 5(2y) = 75 \) simplifies to \( 3x + 10y = 75 \) (Equation 2)

2. Solving the equations
- **From Equation 1:**
\( 2x + 3y = 28 \)
Rearranging gives:
\( 2x = 28 - 3y \)
\( x = 14 - 1.5y \)
- **Substituting \( x \) in Equation 2:**
\( 3(14 - 1.5y) + 10y = 75 \)
\( 42 - 4.5y + 10y = 75 \)
\( 5.5y = 33 \)
\( y = 6 \)
- **Finding \( x \):**
Substituting \( y \) back into Equation 1:
\( 2x + 3(6) = 28 \)
\( 2x + 18 = 28 \)
\( 2x = 10 \)
\( x = 5 \)

3. Calculating the final cost
Now, we can find the cost of 7 oranges and 4 apples:
- Cost = \( 7x + 4y = 7(5) + 4(6) = 35 + 24 = 59 \)
Thus, the original cost of 7 oranges and 4 apples is **₹ 59**.

Solution of the Equations
To solve the equations \( 2y - 5z + 4 = 0 \) and \( 2y + z - 8 = 0 \):

1. Rearranging the equations
- From the first equation:
\( 2y - 5z = -4 \)
\( 2y = 5z - 4 \) (Equation 3)
- From the second equation:
\( z = 8 - 2y \) (Equation 4)

2. Substituting to find solutions
- Substituting Equation 4 into Equation 3:
\( 2y = 5(8 - 2y) - 4 \)
\( 2y = 40 - 10y - 4 \)
\( 12y = 36 \)
\( y = 3 \)
- Finding \( z \):
Substituting \( y \) back into Equation 4:
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Historically, the biggest Challenge to world agriculture has been to achieve a balance between demand for and supply of food. At the level of individual countries, the demand-supply balance can be a critical issue for a closed economy, especially if it is a populous economy and its domestic agriculture is not growing sufficiently enough to ensure food supplies, on an enduring basis; it is not so much and not always, of a constraint for an open, and growing economy, which has adequate exchange surplus to buy food abroad. For the world as a whole, supply-demand balance is always an inescapable prerequisite for warding off hunger and starvation. However, global availability of adequate supply does not necessarily mean that food would automatically move from countries of surplus to of deficit if the latter lack in purchasing power. The uneven distribution of hunger, starvation, under or mal-nourishment, etc., at the world-level, thus owes itself to the presence of empty-pock hungry mouths, overwhelmingly confined to the underdeveloped economies. In as much as ‘a two-square meal’ is of elemental significance to basic human existence, the issue of worldwide supply of food has been gaining significance, in recent times, both because the quantum and the composition of demand has been undergoing big changes, and because, in recent years, the capabilities of individual countries to generate uninterrupted chain of food supplies have come under strain. Food production, marketing and prices, especially price-affordability by the poor in the developing world, have become global issues that need global thinking and global solutions.Q. In a race, a competitor has to collect 6 apples which are kept in a straight line On a track and a bucket is placed at the beginning of the track which is a starting point. The condition is that the competitor can pick only one apple at a time, run back with it and drop it in the bucket. If he has to drop all the apples in the bucket, how much total distance he has to run if the bucket is 5 meters from the first apple and all other apples are placed 3 meters apart ?

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The cost of 2 oranges and 3 apples is ₹ 28. If cost of apple is doubled then cost of 3 oranges and 5 apples is ₹ 75. The original cost of 7 oranges & 4 apples (in (₹)) is: Q117. Solution of 2푦 − 5푧 + 4 = 0 & 2푦 + 푧 − 8 = 0 will be?
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