Question Number 64522 by necx1 last updated on 18/Jul/19
$${In}\:{a}\:{hospital},\:{Dr}\:{Steve}\:{has}\:{worked} \\ $$$${more}\:{night}\:{shifts}\:{than}\:{Dr}\:{Gregg}\:{who} \\ $$$${has}\:{worked}\:{five}\:{night}\:{shifts}.\:{Dr}\:{Okon} \\ $$$${has}\:{worked}\:\mathrm{15}\:{night}\:{shifts}\:{more}\:{than} \\ $$$${Dr}\:{Steve}\:{and}\:{Dr}\:{Gregg}\:{combined}. \\ $$$${Dr}.\:{Uche}\:{has}\:{worked}\:{eight}\:{night}\:{shifts} \\ $$$${less}\:{than}\:{Dr}\:{Steve}.{How}\:{many}\:{night} \\ $$$${shifts}\:{has}\:{Dr}.\:{Steve}\:{worked}? \\ $$$$\left.{a}\left.\right)\left.\mathrm{1}\left.\mathrm{0}\:{b}\right)\mathrm{9}\:{c}\right)\mathrm{8}\:{d}\right)\mathrm{7} \\ $$
Answered by MJS last updated on 19/Jul/19
$${S}={x}>\mathrm{5} \\ $$$${G}=\mathrm{5} \\ $$$${O}=\mathrm{15}+\mathrm{5}+{x}=\mathrm{20}+{x} \\ $$$${U}={x}−\mathrm{8}\:\Rightarrow\:\mathrm{5}<{x}\leqslant\mathrm{8} \\ $$$$\mathrm{more}\:\mathrm{info}\:\mathrm{required} \\ $$