On decreasing each side of cube by 21%, its surface area decreases by?

A triangular ground has 8km, 10km and 6km as its sides. It is to be painted at the rate of Rs. 8 per sq.km. How much will it cost?

A. Rs. 256

B. Rs. 3840

C. Rs. 384

D. Rs. 192

Find perimeter of △LMN, if midpoints of its sides are joined to form △PQR. Also midpoints of △PQR are joined to get △CDE and CD=3, DE=8 and CE=4.

A. 30

B. 72

C. 60

D. 90

Length of a rectangular ground is 15m more than its breadth. What will be its area if Length : Breadth is 7:4?

A. 700 sq.m.

B. 450 sq.m.

C. 900 sq.m.

D. 850 sq.m.

A rectangular margin has a length of 48cm and a total area of 840 sq.cm. The area becomes 2(6/7) times the initial area by just increasing the breadth. How much is the perimeter of the

A. 1.69 m

B. 1.85 m

C. 1.96 m

D. 2.25 m

A plot has a concrete path within its borders on all sides having uniform width of 4m. The plot is rectangular with sides 20m and 15m. Charge of removing concrete is Rs. 6 per sq.m. How much is spent in removing all the concrete?

A. Rs. 1548

B. Rs. 1296

C. Rs. 1500

D. Rs. 1083