A biscuit dough is laid in a rectangular tray of length 2.5m and breath 1 m. Out of this,1000 biscuits of radius 2.8 cm each are cut out in the form a circular disc. How much area of the tray is left with wasted dough?
Answers
Given : Biscuit dough is laid in a rectangular tray of length 2.5m and breadth 1 m.
Out of this,1000 biscuits of radius 2.8 cm each are cut out in the form of a circular disc.
To Find : How much area of the tray is left with wasted dough
Solution:
Biscuit dough is laid in a rectangular tray of length 2.5m and breadth 1 m.
Length = 2.5 m
Breadth = 1 m
Area of tray = 2.5 * 1 = 2.5 m²
radius 2.8 cm
Area of 1 biscuit = π (2.8)²
= (22/7) (2.8)²
= 24.64 cm²
Area of 1000 biscuits = 1000 * 24.64 cm²
Area of 1000 biscuits in m² = 1000 * 24.64 / 10000
= 2.464 m²
area of the tray is left with wasted dough = 2.5 - 2.464
= 0.036 m²
= 360 cm²
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