A shop sells small chocolate bars and large chocolate bars.
Small chocolate bars are sold in packs of 4. Large chocolate bars are sold in packs of 9.
On one day
the number of packs of:the number of packs ofsmall chocolate bars sold:large chocolate bars sold=5:2 \begin{array}{ccc} \text{the number of packs of} & : & \text{the number of packs of} \\ \text{small chocolate bars sold} & : & \text{large chocolate bars sold} \end{array} = 5 : 2 the number of packs ofsmall chocolate bars sold::the number of packs oflarge chocolate bars sold=5:2A total of 19k 19k\,19k chocolate bars were sold.
Work out, in terms of kkk, the number of small chocolate bars sold.
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