In a bar graph if 1 cm represents 30 km, then the length of bar needed to represent 75 km is

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To find the length of the bar needed to represent 75 km, you can use the ratio given in the problem.

Step 1: Identify the ratio. The problem tells you that 1 cm represents 30 km.

Step 2: Set up a proportion to solve for the unknown length. If 1 cm represents 30 km, then x cm will represent 75 km.

So, the proportion is 1/30 = x/75.

Step 3: Solve for x. You can do this by cross-multiplying and then dividing.

(1 * 75) / 30 = x

x = 2.5 cm

So, the length of the bar needed to represent 75 km is 2.5 cm.

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