Work out what percentage of the buttons in the jar are orange ?

Question

There are only red buttons , yellow buttons and orange buttons in a jar. The number of red buttons the number of yellow buttons and the the number of orange buttons are in the ratio 7 : 4 : 9

Answer 1

7+4+9= 20 parts per whole

red: 7/20 = 35%

yellow: 4/20 = 20%

orange: 9/20 = 45%