Total amount He spent on purchasing equipment is =(m+b)$
Part A:
in part A the amount on purchasing other equipment than baseball is getting doubled i.e. $2b <u> then value of m will be (1/2)half of the total amount spent on purchasing baseball i.e. (1/2)m</u>
Part B:
in part B the amount spent on purchasing baseball is getting tripled i.e. <u>3m</u>, then value of b(amount of purchasing other equipment) is<u> (1/3rd) of total</u><u>amount spent on purchasing other equipment</u> and value of mx will be<u> 3mx</u>