exam Maths Puzzle Numerical Ability

Someone invested $24,00 at 8% and the rest at 7.2%. How much did they invest at each same rate if their income from 8% is 2/3 that of 7.2%

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please help me with my homework. I've got a lot of load, and i am having a hard time with these 2. solve and show the solution so i can study it later. thanks.

** 2/(m+1)(m-2) Leading men. Bob Hope was born 2 years after Clark Gable and 2 years before Henry Fonda. In 1951, after all three of them had their birthdays, the sum of their ages was 144. In what years were they born?