(c) Alia ada kelas berenang setiap hari keempat dan kelas menyelam setiap hari keenam.
Sekiranya dia ada kelas berenang dan
kelas menyelam pada 5 Jun, bilakah tarikh
berikutnya dia akan mempunyai kedua-dua
kelas berenang dan menyelam?
Alia has swimming class every fourth day and
diving class every sixth day. If she had swimming
class and diving class on 5 June, when will be
the next date that she has both swimming and
diving classes?​