Day 38 of 60 · Fri 6 Nov · Daily workbook · CAT in 23 days

Day 38: Mixtures & Alligation + Grids & Matching Set + Philosophy RC

Day 38 of the free ThinkCAT 60-day CAT challenge: 5 mixtures & alligation questions and 3 spaced-review QA questions, a full grids & matching DILR set (4 questions), a philosophy RC passage (5 questions), plus para summary and para summary. Every question is a real CAT PYQ.

QA · 8
DILR · 4
VARC · 7
40 minutes
Real CAT questions

Concept card

Mixtures & Alligation

Core formulas

Alligation: cheaper : dearer = (D − M) : (M − C)
Draw x from V and refill, n times: pure left = V(1 − x/V)ⁿ
Mixing solutions: alligate on the % of the same ingredient
Selling price given? Strip the profit first, then alligate on cost

60-second shortcut · Cross the differences

20% and 50% acid to make 30%: (50 − 30) : (30 − 20) = 2 : 1. The one nearer the mean gets the bigger share.

Trap box

Looks like: 20% and 50% make 30% in 20 : 50Actually: (50 − 30) : (30 − 20) = 2 : 1
Looks like: Two 10 L swaps from 100 L milk leave 80 LActually: 100 × 0.9² = 81 L

From the free Arithmetic Formula + Trap Book (PDF).

What's in Day 38

QA: Mixtures & Alligation (5) + 3 spaced-review questions
DILR: Grids & Matching set, 4 questions
RC: Philosophy passage
VA: Para Summary, Para Summary

Year, slot and question number for each question appear with the answer key after you submit.

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