Question

an open bucket with radii 63cm with radii of lower and upper ends 15cm and 25cm respectively is filled with milk find the cost of milk which can completly fill the bucket at rupees 45 per liter
plz urgent ​

Answer 1

Step-by-step explanation:

= 1/3 × 22/7 × 63(252 + 25×15 +152)

= 66 (625 + 375 + 225)

= 80,850 cm3

= 80 L 850 ml

One litre of milk costs Rs 45, and 80 L & 850 ml shall cost = 80.850×45 = Rs 3,638.25

The Drum stores milk of cost = Rs 3,638.25. Total Surface Area of the Drum = π l (R+r) + πR2 + πr2

l =√H2 +(R-r)2

l = 632 + (25-15) 2

= √3969+100

= 63.79 cm

Using the formula πl (R+r) +πR2 +πr2

=22/7 × 63.79 (25+15) + 22/7 (25)2 + 22/7(15)2

= 22/7 × 63.79 × 40 + 22/7 × 625 + 22/7 × 225

= 22/7[2551.6+625+225] = 10,690.74 cm2

Cost of painting per sq cm is 50 ps.

So for 10,690.74 sq cm the cost of painting shall be 10,690.74 × 50 = Rs 5,345 approximately.