That is negative since the elevator is decreasing. If the elevator was going up, it would be positive.
Subtract 9 from both sides of the equation
Mixed number is (wholenumber)+(properfraction)
a proper fraction is a/b where a<b and b≠0
so
percent means parts out of 100
x%=x/100
so
276%=
276/100=
200/100+76/100=
2+76/100=
2+38/50=
2+19/25
2 and 19/25
So we can call first number "n"
Then all five integers would be n, n+1, n+2, n+3, n+4
So sum of them would be 5n + 10 = 100
Now you can solve for n:
5n + 10 = 100
5n = 90
n = 18
Verify: 18 + 19 + 20 + 21 + 22 = 100. All good.
So answer is 18
