Question

A square notice board of side 50 cm has seven notices of dimension 12 cm× 10 cm and nine painting on square sheet of side 10 cm. find the area left uncovered on the notice board?

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Answer 1

Answer:

760 sq.cm.

Step-by-step explanation:

Side of square board =50 cm.

Area of square board = $Side^2 = 50^2 = 2500 cm^2$

Board has seven notices of dimension 12 cm× 10 cm

Area of 1 notice = $12 \times 10 = 120 cm^2$

Area of 7 notice = $120 \times 7 cm^2=840 cm^2$

Board has nine painting on square sheet of side 10 cm.

Area of 1 painting = $side^2 = 10^2 = 100 cm^2$

Area of 9 painting = $100 \times 9 = 900 cm^2$

Total area used by 7 notices and 9 paintings on board = 840+900=1740 sq.cm.

The area left uncovered on the notice board = 2500-1740 = 760 sq.cm.

Hence The area left uncovered on the notice board  is 760 sq.cm.