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Jun

Index

Posted in: Index,

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Jun

Examples 6 to 11

(6) A bag contains rupee, 50 paise coins and 25 paise coins in the ratio 10 : 17 : 16. If the total amount is Rs. 90, find the number of coins of each kind.

Soln. Ratio of values of the coins =

Posted in: Examples 6 to 11,

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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 :…

Posted in: Examples 1 to 5,

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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 $\propt... </p> <div class=$

Posted in: Variation ,

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Jun

Proportion

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

Posted in: Proportion ,

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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 = $\frac{72}{R}$

Posted in: Examples 9 to 11,

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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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Jun

Examples 1 to 4

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

Soln.

C.I. = P $\left [\left (1+\frac{R}{100} \right )^{N}-1&space... </p> <div class=$

Posted in: Examples 1 to 4,

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Jun

Formulae

☼ FORMULAE :

(i) When interest is compounded K times in a year, then

A = P $\left (1 + \frac{R}{100 \times&space... </p> <div class=$

Posted in: Formulae,

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