Pang, Adnan and Muthu are partners in a business. Pang's and Adnan's investments are 3/8 and 7/16 of the business respectively. If Muthu's investment is $1500, find the total amount invested by the three men.

I think the purpose is to show how you arrived at your answer.

What % of 100 is 3/8 & 7/16? Muthu's must be the rest. Then if $1500 is his, figure all the others using%.