Three spring scales (need not be identical) are connected along a straight line as shown in the figure:
The scale on the left is attached to the wall and the scale on the right is pulled with a force of 15N. The reading of the leftmost and middle scale are respectively:

15N each

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5N and 10N

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10N and 15N

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10N and 5N

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Solution

The correct option is A
15N each

Explanation
Newton's third law of motion states that every object has an equal and opposite reaction.
Since there is no acceleration, the net force is 0, which means that the tension exerted on the opposite end of the spring from the force is equal and opposite.
The right-most spring is pulled with a force of 15N. As there is no acceleration of the spring, it pulls the middle spring with the same force.
The same condition follows and there is a force of 15N with which the left-most spring is also pulled.
Hence, the correct option is Option A.

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Three spring scales (need not be identical) are connected along a straight line as shown in the figure:The scale on the left is attached to the wall and the scale on the right is pulled with a force of 15N. The reading of the leftmost and middle scale are respectively:

Three spring scales (need not be identical) are connected along a straight line as shown in the figure:
The scale on the left is attached to the wall and the scale on the right is pulled with a force of 15N. The reading of the leftmost and middle scale are respectively: