Parin

16
Jun
Examples 1 to 5

(1) If  a : b  =  3 : 10  and  b : c  =  15 : 7,  find  a : c  &  a : b : c.

Soln. a : b   =   3 : 10           &       b : c   =   15 : 7

a : b =   3 : 10

=   9 : 30

b : c =   15 : 7

=   30 : 14

a   :  b  :…

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16
Jun
Variation 

Variation  :   If the value of  one variable changes according to the changes in the value of  some other variable, then the relation between them is called variation.

Symbol 

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16
Jun
Proportion 

Proportion  :   Let  {a, b, c, . . . }  and  { x, y, z, . . . } be two equivalent sets of  numbers. If  \frac{a}{x} = 

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15
Jun
Examples 9 to 11

(9) The least number of complete yrs. in which a sum of money put out at 10 % C. I. will more than double is

Soln. Here,  N   =  \frac{72}{R}

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15
Jun
Examples 5 to 8

(5) If  the compound interest on a certain sum for  3  years  at  10 %  per annum be Rs.  49.65,  what would be the sum ?

Soln. We always know that, the C.I. for Rs. 1000 for 3 years at 10 % p.a. is Rs. 331.

Interest       then…

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15
Jun
Examples 1 to 4

(1) Find compound interest on Rs. 50000 at  10 %  per annum for 2 years.

Soln.

C.I. = P

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