Donate SIGN UP

Kids Home Work2

Avatar Image
fever28 | 21:05 Tue 09th Apr 2013 | Quizzes & Puzzles
2 Answers
Sorry to say I'm stuck and already asked a very similar question


I know the answer just be looking at it and doing it in my head

But I don't know how to "work it out". 14 9 and 7

Q: mina has 5 more marbles than Kirsty
Kirsty has 2 more than sen
Altogether they have 30

How many does each child have?


I just picked a low number for seb then added 2 then 5
And from that increased seb till it made 30

But that seems clumsy

Gravatar

Answers

1 to 2 of 2rss feed

Best Answer

No best answer has yet been selected by fever28. Once a best answer has been selected, it will be shown here.

For more on marking an answer as the "Best Answer", please visit our FAQ.
Kirsty has X marbles, so
Mina has (X+5), and
Sen has (X-2)

So X + (X+5) + (X-2) = 30
3X = 30-5+2
3X = 27
X = 9

So Kirsty has 9, Mina has 14 ans Sen has 7
Less mathematical is maybe a bit easier:

Suppose sen had no marbles, then Kirsty would have 2 and mina 7, that makes 9. There are 21 marbles to be added! But if we share them absolutely evenly, then Kirsty will STILL have two more than sen, and mina will STILL have 5 more than Kirsty. An even share of 21 marbles among the three of them is 7 more marbles each, and there's the answer:

(0, 2, 7) + (7, 7, 7) = (7, 9, 14).

1 to 2 of 2rss feed

Do you know the answer?

Kids Home Work2

Answer Question >>

Related Questions

Sorry, we can't find any related questions. Try using the search bar at the top of the page to search for some keywords, or choose a topic and submit your own question.