Ask Singapore Homework?
Upload a photo of a Singapore homework and someone will email you the solution for free.
Question
primary 6 | Maths
2 Answers Below
Anyone can contribute an answer, even non-tutors.
How to find 80? Thank you.
Date Posted: 2 years ago
Views: 1796
See 2 Answers
done
{{ upvoteCount }} Upvotes
clear
{{ downvoteCount * -1 }} Downvotes
If you want to solve using algebra and simultaneous equations.
Another way to solve this is to use logic.
If after putting 4 per box, you’re left with 32 (which can be divided by 4 exactly), it means that the number of lollipops you have is in multiples of 4.
After putting 7 per box, you last box only has 3 lollipops. If you have another 4 more lollipops, you can put all 7 per box equally for all the boxes. Which means that a multiple of 7 - 4 is equal to a multiple of 4
By knowing these 2 statements, you can compare the multiples of 4 and 7. 4x20=80, 7x12=84
84-4=80 which is also a multiple of 4 which fits the statements. Hence the number of lollipops you have is 80. The number of boxes you have is 12.
Another way to solve this is to use logic.
If after putting 4 per box, you’re left with 32 (which can be divided by 4 exactly), it means that the number of lollipops you have is in multiples of 4.
After putting 7 per box, you last box only has 3 lollipops. If you have another 4 more lollipops, you can put all 7 per box equally for all the boxes. Which means that a multiple of 7 - 4 is equal to a multiple of 4
By knowing these 2 statements, you can compare the multiples of 4 and 7. 4x20=80, 7x12=84
84-4=80 which is also a multiple of 4 which fits the statements. Hence the number of lollipops you have is 80. The number of boxes you have is 12.
Date Posted:
2 years ago
360 Tutoring Program