গণিত প্রশ্ন

A company produces two types of product. It uses three plants for the production.the 1st product requires 1 hour in plant 1 and 3 hours in plant tree for producing 1 items.the 2nd product requires to hours each in plant 2 and 3 for one production. Total available hours in plants 1,2 and 3 in a week are 4,12 and 18 respectively. Profit for each item of product 1 is 3 thousand and for product 2 is 5 thousand deposible maximum weekly profit for the company is-