 
 <translate> He spent 3 * .5 = 1.5 years compiling notes. So it took him 3 + 1.5 + .5 = 5 years for everything. Final answer: 5. <hau> Ya shafe shekaru 3 *.5 = 1.5 yana tattara bayanan. Don haka ya ɗauki shekaru 3 + 1.5 +.5 = 5 don komai. Amsar ƙarshe: 5. 