Adding the same amount to each changes the ratio; difference stays fixed

CAT has tested this idea 4 times across 4 papers, from 2017 to 2024. Solve one, and the others are the same method with different numbers or wording, which is why repeated concepts are the most efficient thing to practise.

Question	What it asks	Answer
CAT 2018 Slot 2 · QA Q24	scores 11:14 become 47:56 after equal increase	B
CAT 2019 Slot 2 · QA Q16	each score increases by 6, ending 11:10:3	B
CAT 2024 Slot 2 · QA Q22	ages: past ratio 3:2; future ratio asked	D
CAT 2017 Slot 1 · QA Q1	age 40% of other's, later half; % increase of age	20

Part of Ratio, Mixtures & Averages (84 questions since 2017).