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red → 1/5 green → 1/4
blue + yellow → 1 - 1/5 - 1/4 = 20/20 - 4/20 - 5/20 = 11/20
blue + yellow (%) = 11/20 x 100% = 55%
"The number of yellow beads is 4 times as many as the number of blue beads."
yellow → 4u blue → 1u blue + yellow → 4u + 1u = 5u
5u → 55% 1u (blue) → 55 ÷ 5 = 11%