Write and solve equation to find value of x?

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(99 + 86 + 76 + 95 + x)/5 = 91
multiply both sides by 5:
356 + x = 455
subtract 356 from both sides:
x = 99

- .--...Show more

You have five numbers. The sum of those divided by 5 equals 91.

(99 + 86 + 76 + 95 + x)/5 = 91 The rule is you can do any valid operation on both sides of an equation and it will still be equal. So lets multiply by 5.

99 + 86 + 76 + 95 + x = 455 Do the addition.

356 + x = 455 Subtract 356

x = 99...Show more

The mean of those 5 numbers is 91?

(1/5)(99 + 86 + 76 + 95 + x) = 91
356 + x = 5•91 = 455
x = 455–356 = 99

check 99 + 86 + 76 + 95 + 99 = 455
455/5 = 91
ok...Show more

(99+86+76+95+x)/5 = 91

x = 5*91 - 99 - 86 - 76 - 95 = 99...Show more

here given
mean=91
number,n=5
then,
mean=(99+86+76+95+x)/5
91=(356+x)/5
91*5=356+x
455=356+x
x=455-356
x=99 ans....Show more