Quantitative Aptitude Study Notes for Bank Exams PO and
Clerk
RATIO AND PROPORTION SHORTCUT TRICKS
You know that quantitative
aptitude portion is most important in bank PO and Clerk Exams and for
other competitive exams because if you want a good score in bank exam then you
have to score good in maths. Ratio and
proportion shortcut tricks questions are very important questions for
quantitative aptitude section in Bank
Exams for SBI, IBPS, RRB PO and CLERK exams and other competitive exams. In
competitive exams the most important thing is time management, if you know how to manage
your time then you can do well in Bank
Exams. That’s where
Maths shortcut tricks and formula are comes into action. Examples on All shortcut
tricks on RATIO AND PROPORTION for bank
exams are provided below in this page. These examples will help you to
better understand shortcut tricks on
ratio and proportion.
RATIO:
The number of times one quantity
contains another quantity of the same kind is called the ratio of the two
quantities or Ratio is a quantity which represents the relationship between two
similar quantities.
For example the ratio 4 to 5 is
written as 4:5 or 4/5. 4 and 5 are called the terms of the ratio. 4 is the
first term and 5 is the second term.
Here first term or numerator i.e.
4 is called the ANTECEDENT and second term or denominator i.e. 5 is called the
CONSEQUENT.
PROPORTION:
Consider the two ratios:
1st Ratio 4:12
2nd Ratio 7:21
From the first ratio 4 is the
one-third of 12, and form the second ratio 7 is the one-third of 21. By this
both the ratios are equal. So the equality of ratios is called PROPORTION.
The 4, 12, 7 and 21 are said to
be in proportion.
The proportion may be written as
4 : 12 : : 7 : 21
Or
4:12=7:21
Or
4/12=7/21
The numbers 4, 12, 7 and 21 are
called the terms, 4 is the first term, 12 is the second term, 7 is the third
term and 21 is the fourth term.
First and fourth terms are called
the extremes terms, and the second and third terms are called as mean terms.
Check Our Video Lecture Also: Ratio Tricks
Examples
with shortcut tricks on ratio and proportion are given below:
Ex for compound ratio: Find the
ration compounded of the four ratios:
2:3, 4:5, 8:21, 7:10
Solution: the required ratio = 2×4×8×7/3×5×21×10;
32/225
Inverse ratio:
If 9:7 be the given ration, then
1/9:1/7 or 7:9 is called its inverse or reciprocal ratio.
Ex: divide
1562 into two parts such that one may be to the other as 5:6.
Solution:
1st part = 5×1562/5+6
=5×1562/11
=700
2nd part = 6×1562/11
= 852.
Ex: A, B, C
and D are four quantities of the same kind such that
A:B=3:4, B:C=8:9,
C:D=15:16
a)
Find the ratio A:D
b)
Find A:B:C
Solution:
a)
A/B=3:4, B/C=8:9, C/D=15:16
Then; A/D= A/B × B/C × C/D
= 3/4 × 8/9 × 15/16
= 7:30
b)
A:B=3:4 = 3*2:4*2; Now A:B becomes 6:8, the value of B becomes
equal in both the ratios, in ratio A:B and B:C i.e. 6.
By this the ratio A:B:C will be
6:8:9
Ex: the
ratio of the money with Anu and Sheetal is 7:15 and that with Sheetal and
Poonam is 7:16. If Anu has 490 Rs. Then how much money does Poonam have?
Solution: Anu:Sheetal:Poonam;
7 : 15
7 :
16
49: 105 : 240
The ratio of money with
Anu:Sheetal:Poonam is 49: 105 :
240
So Poonam have Rs. 2400.
Ex: one man
adds 3 litres of water to 12 liters of milk and another 4 liters of water to 10
liters of milk. What is the ratio of the strengths of milk in the two mixtures?
Solution: Strength of milk in the first
mixture = 12/12+3=12/15
Strength of milk in the second
mixture = 10/10+4 = 10/14
Then the ratio of strengths =
12/15 : 10/14
=12*14 : 15*10 = 28:25
Ex: find the
fourth proportional to the numbers 7, 21 and 3.
Solution: if x be the fourth proportional,
then 7:21=3:x
X=21×3 / 7;
= 9
Ex: if 8 men
can reap 80 hectares in 24 days, how many hectares can 36 men reap in 30 days?
Solution: 1st: if 8 men can
reap 80 hectares, then 36 men reap in
8 M : 36 M = 80 hectares : x no
of hectares
X = 36×80 / 8 =360 hectares
2nd: if 360 hectares
can be reaped in 24 days, then hectares reaped in 30 days is
24 days : 30 days = 360 hectares
: x no. of hectares
X= 30×360 / 24
= 450.
Ex: divide
Rs 1350 into three shares proportional to the numbers 2, 3 and 4.
Solution: 1st share = Rs 1350 ×
2 /2+3+4
= 1350 × 2/9; = Rs 300
2nd share = Rs
1350×3/9 = Rs 450
3rd share = Rs 1350 ×
4/9 =Rs 600
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