well first the complement I 90-19=71
and supplement is 180-19=161
120% of 590=1.20*590=708.
For x% of a number y, the answer is x/100*y.
Answer:Gary-18 years brother-10 years
Step-by-step explanation:1st case: brother=1 yrs,gary=3 yrs=>after 6 after: brother =7 yrs gary=9 years
2nd case:......
3rd case:.....
4th case:brother:4 years gary:12 yrs=>after 6 yrs:brother=10 yrs gary=18 yrs=>18-10=8
The mean of your question would be -2.5
