15 minus five out of eleven minus six out of eleven equals?

15 minus five out of eleven minus six out of eleven equals?


15-（5/11）-（6/11）
=15-[(5/11)+(6/11)]
=15-1
=14



Six times of a number minus 15 is equal to four times of the number plus five


6x-15=4x+5
6x-20=4x
2x=20
x=10
Let this number be X



Four times of a number plus 15 equals nine times of it minus 25


4x+15=9x-25
5x=40
x=8



Two fifths of a number is 100, and the number 20% more than that is 100


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