Explanation:

Correct option:1 

Solution:Given that  a plank of wood 4.25 m long and 3.4 m wide is to be cut into square pieces of equal size.

The problem requires cutting the plank into square pieces with no wastage.

The dimensions of the plank are 4.25 m by 3.4 m.

The largest possible square size, we calculate the HCF of 4.25 m and 3.4 m.

 The HCF of 425 cm and 340 cm is 85 cm.

Thus, the largest square piece is 85 cm x 85 cm.

The number of such squares= 425 cm / 85 cm = 5

 Along the width: 340 cm / 85 cm = 4

Total number of squares = 5 * 4 = 20.

Correct Answer: Option 1 - 20 (The actual answer should be 20, not in the provided options)

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