IBPS Clerk Main 2016: Quants Day 1

Explanation:
In this first you will have to calculate total students in each fiscal year, and then find the percentage increase for adjacent years.
Like for year 2012-13, total students are 15,10,000
For year 2013-2014, total students are 25,00,000.
So % increase in 2013-2014= (25,00,000 – 15,10,000)/15,10,000 * 100 = 65.56%

Explanation:
For year 2012-13, total students are 15,10,000
For year 2013-2014, total students are 25,00,000.
So new students are 25,00,000 – 15,10,000 = 99,0000

Explanation:
520000 : 120000
13 : 3

Explanation:
For year 2010-11, students in Private schools are 12,000
For year 2013-2014, students in Private schools are 9,50,000.
% increase = (9,50,000 -12,000) / 12,000 * 100 = 7816.67 ≈ 8000

Explanation:
Total students in 2010-11 = 12,000 + 2,30,000 = 2,42,000
So required % = 12000/242000 * 100 = 4.9 ≈ 5

Explanation:
18 m in 26 days, so 13 men do in 18*26/13 = 36 days. They complete 1/3rd of work. So number of days required by 13 men to complete that work is 36* 1/3= 12 days.
Now:
20 w in 33 days, so 22 w do in 20*33/22 = 30 days. They complete 2/3rd of work. So number of days required by 22 women to complete that work is 30* 2/3 = 20 days.
So total 12 +20 = 32 days

Explanation:
It can be calculated as:
CP = 1200 *100 / [1/3 *9 + 2/3 * (-3)] = 1,20,000
* 1/3rd sold at 9% profit, 2/3rd sold at 3% loss

Explanation:
Probability of all blue = ³C₃ / ¹²C₃ = 1/220
Probability of all green = ⁵C₃ / ¹²C₃ = 10/220
So probability of all blue or all green = 1/220 + 10/220 = 11/220

Explanation:
If P is the principal, SI for 2 years = P*20*2/100 = 2P/5
So, SI for 1 year = P/5
CI for 2 years = P/5 + (P/5 + 20/100 * P/5) = 2P/5 + P/25 = 11P/25
Now, 11P/25 = 3520, so P = 8,000
So SI = 2*8000/5 = 3200

Explanation:
Savings = 10,000 – 6000 = 4000
Income becomes = (110/100)*10,000 = 11,000
Exp. becomes = (120/100)*6,000 = 7,200
So savings now = 11000 – 7200 = 3800
So % decrease in savings = (4000-3800)/4000 * 100 = 5%