exam Maths Puzzle Numerical Ability

Hi, ive been asked to answer the following questions, and having great difficulty, i have managed to answer the first question, (although with ALOT of help), but i was wondering if

Read Solution (Total 0)

exam Other Question

Bob invested $20,000, part at 14% and part at 13%. If the total interest at the end of the year is $2,720, how much did he invest at 14%?

Please help me on this
log(1/3)27