4. Andrea sells flower pots of different sizes. The price of a small flower pot is RM10, medium flower pot RM15 and large flower pot RM40. Every month, the number of small flower pots
sold is equal to the total number of the medium and large flower pots sold. The number of
medium flower pots sold is twice the number of large flower pots sold. Andrea needs to pay a
rent of RM300 per month for her business premise. What are the minimum numbers of pots
of each size which Andrea has to sell in a month so that she can pay the monthly rent?