Question Number 117439 by wongb1506 last updated on 11/Oct/20
Answered by MJS_new last updated on 11/Oct/20
$$\frac{\mathrm{11}}{{a}}=\frac{{b}}{\mathrm{5}}\:\Rightarrow\:{b}=\frac{\mathrm{55}}{{a}}\:\Rightarrow\:{ab}=\mathrm{55} \\ $$
Commented by wongb1506 last updated on 11/Oct/20
thank you very much