Day 30 of 60 · Thu 29 Oct · Daily workbook · CAT in 31 days

Day 30: Ratio & Proportion + Chart DI Set + Politics & History RC

Day 30 of the free ThinkCAT 60-day CAT challenge: 5 ratio & proportion questions and 3 spaced-review QA questions, a full chart di DILR set (4 questions), a politics & history RC passage (4 questions), plus para jumbles and para summary. Every question is a real CAT PYQ.

QA · 8
DILR · 4
VARC · 6
40 minutes
Real CAT questions

Concept card

Ratio & Proportion

Core formulas

A : B = 3 : 5 ⇒ A = 3k, B = 5k; solve for k
Chain A : B and B : C by making B equal (use the LCM)
Componendo-dividendo: a/b = c/d ⇒ (a + b)/(a − b) = (c + d)/(c − d)
Direct: y = kx. Inverse: xy = k. Joint: y = kxz

60-second shortcut · Match the difference

Ages 3 : 5 now, 5 : 7 in 10 years. Both differ by 2 parts, so 2 parts = 10 years: ages 15 and 25.

Trap box

Looks like: Add 2 to both terms: 3 : 5 stays 3 : 5Actually: It becomes 5 : 7
Looks like: A : B = 2 : 3, B : C = 4 : 5 ⇒ 2 : 3 : 5Actually: Make B equal: 8 : 12 : 15

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

What's in Day 30

QA: Ratio & Proportion (5) + 3 spaced-review questions
DILR: Chart DI set, 4 questions
RC: Politics & History passage
VA: Para Jumbles, Para Summary

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

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