the average of five numbers is 5 .the average of first four numbers is 4 .the fifth number is
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Answered by
6
Answer:
9
Hello!
I hope this helps you. Have a great day!!!
Step-by-step explanation:
Let the five numbers be a, b, c, d, e.
Averge of all five is 5
=> ( a + b + c + d + e ) / 5 = 5
=> a + b + c + d + e = 25 (**)
Average of first four is 4
=> ( a + b + c + d ) / 4 = 4
=> a + b + c + d = 16 (++)
Subtracting equation (++) from equation (**) gives:
e = 25 - 16 = 9
Anonymous:
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My pleasure. Glad to have helped.
Two train start at the same time from 2 station, x and y, 900 kms apart and move towards each other at an average speed of 38 and 22 km per hour respectively. they will meet after
help me to solve this
Answered by
2
Let the fifth number be x
Let the average of first four numbers ( let them be a, b, c, d) = a+b+c+d/4 =4
=> a+b+c+d=4x4=16
Average of all numbers=5
=> a+b+c+d+x/5=5 (send denominator 5 to the other side)
=>(a+b+c+d) +x=5x5=25
=>(16) +x=25
=> x=25 - 16
=>x=9
This is the answer
thank you
it's ok
brilliants don't accept thanks
but I'm accepting
cus this is the first maths sum I solved in brainly
ok
Glad to have been witness to your first maths one mgeethik. Great stuff! Hope you're able to keep helping out.
guys i got more questions can you just help
yep
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