Are these quantities right for concrete?

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1.2 m x 1.8 m x 150mm c20 (1:2:4).

Allowing for wastage, 6 cement, 12 sharp sand and 24 aggregate?

Seems a lot for what seems to be a relatively small volume (0.324m3).

???
 
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You need just over 1/2 a tonne of ballast (sand and gravel mixed) and four x 25 kg's of cement.

The make-up ratio of ballast is 4 parts 20mm gravel to 2 parts sharp sand. It is widely available as ballast so why buy it separately.

The concrete mix should be 6 ballast to 1 cement plus aqua.
 
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