Question

7. Find the cost of painting a rectangular truck, whose measurements are 90 cm x 60 cm
x 45 cm at the rate of 200 per square metre.​

Answer 1

Answer:

The cost of painting a rectangular truck, whose measurements are 90 cm x 60 cm x 45 cm at the rate of 200 per square metre. is Rs 486.

Step-by-step explanation:

Dimensions are 90cm × 60cm × 45cm

T.S.A = 2(lb + bh + hl)

= 2(90× 60 + 60× 45 + 45×90)

= 2(5400 + 2700 + 4050)

= 2(12150)

= 2 × 12150

= 24300

(1m² = 10000cm²)

(24300/10000) = 2.43m square

T.S.A = 24300 cm square = 2.43 m square

Painting if for Rs.200 per m square

= 200  × 2.43 = Rs. 486

Answer 2

Answer:

Rs.

486

Step-by-step explanation:

l= 90 cm b= 60cm h= 45cm

Surface area of truck= 2(lb+bh+lh)

= 2[(90*60)+(60*45)+(45*90)]

= 2(5400+2700+4050)

= 2*12,150

= 24,300 sq.cm

24,300 sq.cm= 2.43 sq.m

Cost for painting 2.43 sq.m

=Rs(200*2.43)

=Rs.486

Hope it helps!