exam Maths Puzzle Numerical Ability

a box contains 4 blue balls, 5 green balls and 3 yellow balls you randomly select 3 balls, one at a time, from the box without replacing a selected ball. What is the probability o

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Carla invested $28,000, part at 14% and part at 9%. If the total interest at the end of the year is $3,370, how muc did she invest at 14%

These problems confuse me each time, can you help? Thank you so much! an airplane tooke 2 hours to fly 600 km against a head wind. The return trip with the wind took 1 2/3 hours. Find the speed of the plane in still air.