Question Number 102644 by otchereabdullai@gmail.com last updated on 10/Jul/20
Answered by Rasheed.Sindhi last updated on 10/Jul/20
$${x}:\:{tricycles},{y}:{taxicabs} \\ $$$${x}+{y}=\mathrm{20} \\ $$$$\mathrm{2}{x}+\mathrm{4}{y}=\mathrm{66} \\ $$$$\mathrm{2}{x}+\mathrm{2}{y}=\mathrm{40} \\ $$$$\mathrm{2}{x}+\mathrm{4}{y}=\mathrm{66} \\ $$$$\:\:\:\:\:\:\:\:\:\:\mathrm{2}{y}=\mathrm{26} \\ $$$$\:\:\:\:\:\:\:\:\:\:\:\:{y}=\mathrm{13} \\ $$$$\:{x}=\mathrm{20}−\mathrm{13}=\mathrm{7} \\ $$
Commented by otchereabdullai@gmail.com last updated on 10/Jul/20
$$\mathrm{thanks}\:\mathrm{a}\:\mathrm{lot}\:\mathrm{sir}!\:\mathrm{i}\:\mathrm{appreciate}\:\mathrm{your}\:\mathrm{time} \\ $$
Answered by Rasheed.Sindhi last updated on 10/Jul/20
$${Using}\:{only}\:{single}\:{variable}. \\ $$$${tricycles}:{x} \\ $$$${taxicabs}:\mathrm{20}−{x} \\ $$$$\mathrm{2}{x}+\mathrm{4}\left(\mathrm{20}−{x}\right)=\mathrm{66} \\ $$$$\:\:\:\:\:\:\:{x}=\mathrm{7}\::{tricycles} \\ $$$$\mathrm{20}−{x}=\mathrm{20}−\mathrm{7}=\mathrm{13}\::\:{taxicabs} \\ $$