Question

1. The ratio of Blackballs to white balls
in a bag is 5:3. If the total number
of balls are 72 then find the number of
black balls.
​

Answer 1

Answer:

Let the no of balls be 5X and 3X 5X+3X=8X

8X=72

X=72/8

X=9

BLACK BALLS 5×9=45

WHITE BALLS 3×9=27

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Answer 2

number of black balls = 45

The ratio of black balls to white balls in a bag is 5 : 3.

Let proportionality constant is r

then, number of black balls = 5r

number of white balls = 3r

a/c to question,

total number of balls = 72

⇒5r + 3r = 72

⇒8r = 72

⇒r = 9

so, number of black balls = 5r = 5 × 9 = 45

number of white balls = 3r = 3 × 9 = 27

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