71.

From a point on a bridge across the river, the angles of depression of the banks on opposite sides of the river are 30° and 45° respectively. If the bridge is at a height of 2.5 m from the banks, then the width of the river is (take ):

• 5.83 m

• 6.83 m

• 5.76 m

• 6.87 m

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

The percentage of steel used in the construction of a house is:

• 10%

• 12%

• 20%

• 36%

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

The ratio of cement and bricks used in the construction is:

• 3 : 4

• 2 : 3

• 4 : 3

• 2 : 5

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

If the cost of cement is â‚¹ 5,000/-, then the labour cost is

• ₹ 5,500

• ₹ 6,250

• ₹ 9,000

• ₹ 4,000

The pie-chart given below shows usage of materials in a construction of house. Study the chart and answer the questions.

The average of percentages of steel, cement and miscellaneous items used in the construction is

• 10%

• 25%

• 20%

• 35%