Question

Find the cost of painting a rectangular truck whose measure are 90cm × 60cm ×45cm at rupees of 200 per square metre.

Answer 1

Hi !!!

Here is your answer,

Given : -
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


Hope it helps.

Answer 2

$Hello.. \\ Answer.. \\ \\ Given, \\ \\ Dimension \: \: are \: \: 90cm \times 60cm \: \times 45cm \\ \\ TSA = 2(LB + BH + HL) \\ \\ = 2(90 \times 60 + 60 \times 45 + 45 \times 90) \\ \\ = 2(5400 + 2700 + 4050) \\ \\ = 2(12150) \\ \\ = 24300 \\ \\ ( {1m}^{2} = 10000 {cm}^{2} ) \\ \\ (24300 \div 10000c {m}^{2} = 2.43 {m}^{2} \\ \\ T.S.A = 24300 {cm}^{2} = 2.43 {m}^{2} \\ \\ Painting \: \: of \: \: it \: \: for \: \: Rs \: 200 \: \: per \: {m}^{2} \\ \\2.43 \times 200 = Rs468 \\ \\ \\ \\ Hope \: \: it \: \: helped$
☺☺☺☺☺