Question

the height h of a cylinder is 5 units less than 3 times its radius r. which exoression

Answer 1

$\huge\mathbb{A~N~S~W~E~R}$

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☆ Hieght of cylinder = 5 units

☆ Radius = less than 3 times of height :-

= 5*3-3 = 12 cm

$\huge\mathbb{A~N~S~W~E~R~}$

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→ Find area of four walls :-

$= 2h(l + b) \\ \\ = 6 \times 9 \\ \\ = 54 { \: m}^{2}$

→ Find area of ceiling :-

$= l \times b \\ \\ = 5 \times 4 \\ \\ = 20 { \: m}^{2}$

→ Area for white washing :-

$= (54 + 20) { \: cm }^{2} \\ \\ = 74 \: {m}^{2}$

→ Cost for white washing :-

$= 74 \times 7.5$

${=~555~Rs.}$

${\large\color{Red}{Answer~is~ Rs.~555~ }}$

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