Problem: if 4 spiders make 4 webs in 4 days , then 1 spider will make 1 web in how many days ?
Rationale: "explanation : let the required number days be x . less spiders , more days ( indirect proportion ) less webs , less days ( direct proportion ) spiders 1 : 4 | | : : 4 : 1 webs 4 : 1 | = > 1 * 4 * x = 4 * 1 * 4 = > x = 4 answer : d"
annotated_formula: multiply(1, 4)