# Maths problem of the week

Molly went swimming every day for 5 days.

She swam 80 lengths during the 5 days.

Each day she swam 4 less lengths than the day before, how many lengths did she swim each day?

## 11 thoughts on “Maths problem of the week”

1. Samir

On Monday Molly swam 30 lengths and all the rest she swam 10 lengths
30+5×10=50 altogether =80 lengths.

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• sverdie

A good try Samir! Unfortunately , this is not the correct answer. Read the problem again.

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2. Samir

80-4=76×5=380 lengths

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• sverdie

Keep trying Samir. Let me re-word some parts of the problem.
Molly swam 80 lengths altogether. However, she did not swim the same amount of length each day but she swam 4 lengths less each day.
For example if on Monday she swam 24 lengths on Tuesday she swam 20, and so on.
Hope this will help.

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3. Samir

Day 1
Day2
Day3
Day4
Day5

Total
=80

You need to use the 4 times table because it is 4 less day than the day before.
4,8,12,16,20,24,28,32,36,40,44,48

4
8
12
16
20

20+16=36+12=48+4=52+8=60 60 is to less than 80

8
12
16
20
24

24+20=44+16=60+12=72+8=80

Day5 =8
Day4 =12
Day3 =16
Day2 =20
Day1 =24

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• sverdie

Well done! You have cracked it!

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• sverdie

Show me the 4 less lengths a day.

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4. Samir

Day 1
Day2
Day3
Day4
Day5

Total
=80

You need to use the 4 times table because it is 4 less day than the day before.
4,8,12,16,20,24,28,32

4
8
12
16
20

20+16=36+12=48+4=52+8=60 60 is to less than 80

8
12
16
20
24

24+20=44+16=60+12=72+8=80

Day5 =8
Day4 =12
Day3 =16
Day2 =20
Day1 =24

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5. Alisha

Is this the answer day1 24 day 2 20 day 3 16 day 4 12 and day 5 8
Alisha Ali

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• sverdie

That is the correct answer! Well done.

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6. Alisha

Shsl i bring in paper

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