Question

please solve questions........urgent please solve question no. 32

Answer 1

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Answer 2

dimension of frustum shaped bucket:
radius of the lower end=8cm
radius of the upper end=20cm
height=16cm
∴ slant height=√h²+(R-r)²
                      =√16²+(20-8)²
                      =√256+144
                      =√400
                      =20cm

TSA of the bucket=πl(R+r)+πr²
                            =3.14×20(20+8)+3.14×8²
                            =1758.4+200.96
                            =1959.36cm²

rate of metal sheet=Rs 15 per 100cm²
∴cost of metal sheet used for the bucket
                              =Rs 15×1959.36/100
                              =Rs 15×19.5936
                              =Rs 293.904

volume of the bucket=1/3πh(R²+r²+R×r)
                                 =1/3×3.14×16(400+64+160)
                                 =1/3×3.14×9984
                                 =10449.92cm³

rate of milk=Rs 16 per litre
∴cost of milk which can completely fill the bucket
                  =16×10449.92/1000
                  =167.19872 Rs (roundly 167.20 Rs)