Question

7 Kamala measured the size of blackboard. The length of the black board is 1lm and the
height is 8 m. The area of the blackboard is
a.
88m
b. 88m?
C.
88m2
d. 88 cm?​

Answer 1

Answer:

The length of a rectangular blackboard id three times its width. If the width is 1.5m, Find its area . Also find the cost of painting the blackboard at the rate of Rs5.50persq.m

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Answer

Given:Length=3x and Breadth=x

Width=1.5m=150cm

Perimeter=2(l+b)

⇒150=2(3x+x)

⇒150=8x

⇒x=

8

150

=18.7

∴ Breadth is 18.7m and length is 3x=3×18.7=56.1m

∴Area of the black board=18.7×56.1=1,049.07‬m

2

Cost of painting per sq.m=Rs5.50

Cost of painting 1,049.07‬m

2

=Rs1,049.07×5.50=Rs.5,769.885

Explanation:

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