The average weight of a class of 20 boys was calculated to be 58.4 kgs and it was later found that one weight was misread as 56 kg instead of 65 kg. What is the correct weight?
A). 28.85 kgs
B). 38.85 kgs
C). 48.85 kgs
D). 58.85 kgs
A TV has a length of 80 cm and a width of 50 cm. If the border is 5 cm thick, the area of the screen is
A). 2800 cm²
B). 3000 cm²
C). 3400 cm²
D). 3700 cm²
A park shaped like a square with a side of 30 metres has an alley with the width of 2 metres. What's the area of the green zone?
A). 830 m²
B). 835 m²
C). 840 m²
D). 845 m²
What is the area of the blue zone? if length of blue zone is 12 m and width is 9 m?
A). 51 m²
B). 54 m²
C). 56 m²
D). 59 m²
On a field whose length is 25 metres and width is 12 metres a house was built the shape of a square whose side is 9 metres. What's the area of the garden?
A). 216 m²
B). 217 m²
C). 218 m²
D). 219 m²