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Work out the following.
13)
1
⁄
4
of 20=
14)
1
⁄
11
of 11=
15)
1
⁄
4
of 24=
16)
1
⁄
6
of 60=
17)
1
⁄
8
of 32=
18)
1
⁄
5
of 35=