December 2020
Intermediate to advanced
255 pages
9h 16m
English
Content preview from Pearson IIT Foundation Class 6 Mathematics by Pearson
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Ratio and Proportion
5.3
(II)
8
15
7
12
:
The LCM of 15 and 12 is 60.
8
15
× 60 :
7
12
× 60 = 32 : 35
EXAMPLE 5.2
Divide the amount ` 540 in the ratio 5 : 4.
SOLUTION
The sum of the terms of the ratio 5 + 4 = 9
The required amounts are
5
9
(` 540) and
4
9
(` 540), i.e., ` 300 and ` 240.
EXAMPLE 5.3
250 mL of water is added to 750 mL of milk. Find the ratio of milk and water in the solution.
SOLUTION
750 mL : 250 mL = 750 : 250 = 75 : 25 = 3 : 1
PROPORTION
The equality of two ratios is called proportion.
For example, if a : b = c : d, i.e., a/b = c/d, then a, b, c and d are said to be in proportion.
(1) The values of a, b, c and d are respectively known as the r
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