Bob's answer to Coral's Primary 5 Maths Whole Numbers Singapore question.
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Not sure if you have learnt algebra, but i tried to make it as understandable as possible. Always lay out everything you know, and try to fill in the gaps from there.
Date Posted:
2 years ago
Thank you si much. Managed to do another way..
70-50=20
7-3=4
20 ÷ 4=5
7x5=35
35+50=85
70-50=20
7-3=4
20 ÷ 4=5
7x5=35
35+50=85
Correct.
Every day, the difference increases by 4.
(7 - 3 = 4)
From 50 more to 70 more (when she finished her biscuits) , that is an increase of 20.
(70 - 50 = 20)
How many days needed to increase to 20?
20 ÷ 4 = 5
Another way to get Ken's biscuits at first :
= 70 left + 3 × 5 (for the 5 days he ate)
= 70 + 15
= 85
Every day, the difference increases by 4.
(7 - 3 = 4)
From 50 more to 70 more (when she finished her biscuits) , that is an increase of 20.
(70 - 50 = 20)
How many days needed to increase to 20?
20 ÷ 4 = 5
Another way to get Ken's biscuits at first :
= 70 left + 3 × 5 (for the 5 days he ate)
= 70 + 15
= 85
Thank you
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