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Question

At a game, Selena, Rihanna and Tina had a total of 320 clips. Selena had the least number of clips. The ratio of Rihanna’s clips to Tina’s clips was 5:4 at first. After Selena and Rihanna had each lost 1/2 of their clips, Rihanna had 50 clips more than Selena. The girls had a total of 220 clips in the end.

a) What is the ratio of the number of Rihanna’s clips to the number of Tina’s clips at the end of the game?

b) How many clips did Selena have at first?

Answer

 

 

 

 

 

Rihanna

:

Tina

:

Selena

At first

5 units

:

4 units

:

Selena

Cards lost

1/2 x 5 units = 2.5 units

 

Unchanged

 

1/2 Selena

Cards left in the end

5 units – 2.5 units

= 2.5 units

:

4 units

:

Selena – 1/2 Selena

= 1/2 Selena

OR

2.5 units – 50

 

 

 

(a)

 

Selena’s cards left in the end

→ 2.5 units – 50

 

Cards left in the end

= 2.5 units + 4 units + 2.5 units – 50

= 9 units – 50

 

9 units – 50 = 220

 

9 units = 220 + 50

             = 270

 

1 unit = 270 ÷9

           = 30

 

Rihanna’s cards left in the end

= 2.5 units

= 2.5 x 30

= 75

 

Tina’s cards left in the end

= 4 units

 = 4 x 30

 = 120

 

Rihanna’s cards : Tina’s cards

75 : 120

5 : 8 (Ans)

(b)

 

Selena’s cards left in the end

→ 2.5 units – 50

 = (2.5 x 30) – 50

 = 75 – 50

 = 25

 

Since she lost half of her cards, her number of cards at first should be twice of what was left in the end.

 

Selena’s cards at first = 25 x 2

                                        = 50 (Ans)

 

 

1 Reply 0 Likes

Hi may I know which part of the English says half of Selena is 2.5u?

1 Reply 0 Likes

Hi S277400, 

half of Selena is not 2.5 units. 

 

My working shows half of Selena is 2.5 units – 50.

Hope it clarifies.

1 Reply 0 Likes

Hi I understand the part where half of Selena less off 50 but can’t grasp why half of Selena is 2.5(u). I was try to understand the English but to not avail.

1 Reply 0 Likes

Hi, that is because the question states that after Rihanna lost half of her clips, she has 50 more clips than Selena. So, to find Selena’s clips in the end, we need to minus 50 from 2.5 units.

Refer to my working in the table.

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Noted thanks 

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Rihanna

:

Tina

:

Selena

At first

5 units

:

4 units

:

Selena

Cards lost

x 5 units = 2.5 units

 

Unchanged

 

–  1/2 Serene

Cards left in the end

5 units – 2.5 units

= 2.5 units

:

4 units

:

Serene at first – 1/2 Serene

= 1/2 Serene

OR

2.5 units – 50

 

 

 

(a)

 

Selena’s cards left in the end

→ 2.5 units – 50

 

Cards left in the end

= 2.5 units + 4 units + 2.5 units – 50

= 9 units – 50

 

9 units – 50 = 220

 

9 units = 220 + 50

              = 270

 

1 unit = 270 ÷9

           = 30

 

Rihanna’s cards left in the end

= 2.5 units

= 2.5 x 30

= 75

 

Tina’s cards left in the end

= 4 units

= 4 x 30

= 120

 

Rihanna’s cards : Tina’s cards

75 : 120

5 : 8 (Ans)

(b)

Selena’s cards left in the end

→ 2.5 units – 50

 = (2.5 x 30) – 50

 = 75 – 50

 = 25

 

Since she lost half of her cards, her number of cards at first should be twice of what was left in the end.

 

Selena’s cards at first = 25 x 2

                                           = 50 (Ans)

 

 

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