The mean of 5 numbers is 40. If the mean ofthe first 2 numbers is 45 and that of last 2is 42. Find the third number. About the author Eden
Answer: step by step explanation: Given:The mean of 5 numbers is 40 Mean of first two numbers is 45 Mean of last two numbers is 42 let 5 numbers are a,b,c,d,e a+b+c+d+e/5=40 a+b+c+d+e=200....…....….....(1) a+b/2=45 a+b=90...............(2) d+e/2=42 d+e=84...............(3) substitute equation 2 and 3 in 1 90+c+84=200 c=200–174 c=26 so third number is 26 Reply
Answer:
step by step explanation:
Given:The mean of 5 numbers is 40
Mean of first two numbers is 45
Mean of last two numbers is 42
let 5 numbers are
a,b,c,d,e
a+b+c+d+e/5=40
a+b+c+d+e=200....…....….....(1)
a+b/2=45
a+b=90...............(2)
d+e/2=42
d+e=84...............(3)
substitute equation 2 and 3 in 1
90+c+84=200
c=200–174
c=26
so third number is 26
Answer:
the third number should be 26
hope it helps