Question

3. If the cost of painting 1 mof wooden board is Rs. 5, then the coat o penting a wooden
rectangular prism of sides 4 m, 3 m, and 5 mio.
(a)300
(b)340
(4470
wios. Fontane among the two​

Answer 1

Given : the cost of painting 1 m² of wooden board is Rs. 5,

To Find : the cost of painting a wooden rectangular prism of sides 4 m, 3 m, and 5 m  

(a)300

(b)340

(4470

Solution:

Surface area of rectangular prism

= 2( 4 * 3 + 4 * 5 + 3 * 5)

= 2( 12 + 20 + 15)

= 2(47)

= 94  m²

Cost of painting 1 m² = Rs 5

Cost of painting 94 m² = 94 x 5  = 470  Rs

Rs 470 is correct answer

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