Here are five number cards. 2
5
17
8
9
One of the cards is removed and the mean average
of the demaining four number cards is 6
Which card was removed?
You must show your working.
Note: Please make sure your final answer says card.

Card:: 17

Step-by-step explanation:

Mean is nothing but all of the numbers added together then multiplied by the amount of numbers that there are. In this case, the mean for all of them are 8.2. When you take away the 17, you would be let with 2+5+8+9/4 this results in 24/4 which equals 6.

HOPE THIS HELPS!!!

i think it is everything has to equal 180 so, if i correct 4=c. 6=d. 8=a. 7=b. and the last question would be c. because they are parallel lines and they are congruent.

step-by-step explanation:

the reason everything has to equal to 180 is because that is how it works. i'm guessing that is its rule. 4 and 8 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 6 and 7 are congruent and parallel so, that would be 30+30 because they have the same number. it would equal 60. 60+60 is 180. so, now you have your answer