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sadiesnider9
12.04.2020 •
Mathematics
Tom has six banknotes.
The value of each note is £5 or £10 or £20
He can make £20 with three notes.
He can make £55 with four notes.
He cannot make £25 with three notes.
He cannot make £25 with four notes.
List the six notes from smallest value to largest value.
£
£
£
£
£
£ _
Smallest
Largest
Total marks: 2
Solved
Show answers
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Ответ:
£5, £5, £10, £20, £20, £20.
Step-by-step explanation:
To make £20 with 3 notes he uses 2 5's and a 10 . That is the only way he can make £20 with 3 notes.
To make £55 with 4 notes he could use 2 £20's , £10 and a £5. That is the only way to make £55 with 4 notes.
So the possible list is:
20, 20 ,10 ,5, x, y where x and y are the 2 extra notes.
He cannot make £25 with 3 notes so neither x nor y is £10.
He cannot make £25 with 4 notes so x and y cannot both be £5. But 1 must be £5 because he needs 2 £5 to make the £20.
So one must be £5 and the other must be £20.
Ответ:
I think it is add to eliminate x