If 0.06 (x - 5) = 0.04 (x + 8) then x is equal to _____.
31
11
20
15
0.06 (x - 5) = 0.04 (x + 8)
0.06x - 0.30 = 0.04x + 0.32
0.06x - 0.04x = 0.32 + 0.30
0.02x = 0.62
x = 0.62/0.02 = 31
If 20Cr+1=20Cr−1, then r is equal to
If∑20i−lsin−1xi=10π, then ∑20i−lxi is equal to
If 0.75: x :: 5:8, then x is equal to?