its wrong

It should be correct

You can cross reference with others who have solved this question.

https://brainly.in/question/27948076

https://www.gauthmath.com/solution/7-A-chef-had-some-cooking-oil-After-he-bought-another-6-2-of-cooking-oil-he-had--1700607787157509

https://www.gauthmath.com/solution/7-A-chef-had-some-cooking-oil-oil-as-he-did-at-first-After-he-bought-another-6-2-1700607798387717