one way is to use brute force (find bigger equivalent ratios and add them) 11:5 to make them bigger, we multiply both by the same number 11:5 11+5=16 nope 11:5 times 5 to both=55:25 add 55+25=80 we can just add the numbers before multiplying and then multiply after
11+5=16 16 times what=18 divide both sides by 16 1.125=what we need to multiply each by 1.125 11:5 times 1.125 to both =12.375 : 5.625 12.375+5.625=18