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3 years ago

Tanya paints the walls of her family room.

Mathematics

1 answer:

galina1969 [7]3 years ago

8 0

Answer:

6.1

Step-by-step explanation:

Surface area of the room = 2(lw + hl + hw)

Where,

l = length = 7 m

w = width = 4 m

h = height = 3 m

Surface area of the room = 2(lw + hl + hw)

= 2(7*4 + 3*7 + 3*4)

= 2(28 + 21 + 12)

= 2(61)

= 122 m²

A 4-L can of paint covers 40 m²

Number of 4-L can of paint needed for 1 coat = 122 m² / 40 m²

= 3.05 4-L can of paint

The walls need 2 coats of paint

Number of 4-L can of paint needed for 2 coats = Number of 4-L can of paint needed for 1 coat × 2

= 3.05 × 2

= 6.1 4-L can of paint

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