tolong pakai cara nya yaa

r₁=d/2
   =9dm/2
   =4,5dm

V₁=πr₁²t₁
    =(3,14)(4,5dm)²(12,5dm)
    =39,25dm(20,25dm²)
    =794,8125dm³

V₂=πr₂²t₂
    =(3,14)(15cm)²(25cm)
    =78,5cm(225cm²)
    =17.662,5cm³
    =17,6625dm³

banyak tabung=V₁/V₂
                        =794,8125dm³/17,6625dm³
                        =45