Question

There are 70 white beads and 105 red beads in a necklace. Find the ratio of:

a) White beads : Red beads

b) Red beads : Total beads

c) Total beads : White beads​

Answer 1

Answer:

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Step-by-step explanation:

First box contains 8 black and 12 white beads Second box contains 9 black and 6 white beads.

(a) One black bead from each box is taken.

Number of such cases = 8×9=72

Total number of possibilities = 20×15=300

Probablity of getting both black beads =

300

72

=

25

6

(b) One black and one white bead is taken.

So if one black bead is taken from first box then one white bead is taken from second box and if one white bead is taken from first box then one black bead is taken from second box.

Number of such cases = 8×6+12×9=48+108=156

Total number of possibilities = 20×15=300

Probablity of getting one black and one white bead =

300

156

=

25

13

Answer 2

Answer:

A. white beads: Red beads

total number of white beads

= 75.

total number of red beads = 105.

Ratio = 75/ 105

= 15/ 21

=

5/7

5:7 ans...

B. total number of red beads = 105.

total number of beads = 75+

105

180.

Ratio= 105/ 180

=7/12

7:12 ans.

C. total number of beads = 180.

total number of white beads

= 70

Ratio = 180/75

12/5

12:5