AC Lim's answer to Choo's Primary 5 Maths Whole Numbers Singapore question.
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Number of book is same.
Let the number of book = u
If spend on science books,
Total money = $7×u + $6 = 7u + 6
If spend on math books,
Total money = $9×u - $8 = 9u - 8
Therefore
9u-8=7u+6
2u = 14
u = 7
a) Number of books = u = 7 books.
b) Money he have = 7×7 +6 =$55.
Hope this helps.
Let the number of book = u
If spend on science books,
Total money = $7×u + $6 = 7u + 6
If spend on math books,
Total money = $9×u - $8 = 9u - 8
Therefore
9u-8=7u+6
2u = 14
u = 7
a) Number of books = u = 7 books.
b) Money he have = 7×7 +6 =$55.
Hope this helps.
Date Posted:
3 years ago
Not sure why a need answer was requested, but this is very correct.
Choo, this is analogous to my explanation. The 'u' you see here is the same as the unknown number of books
Choo, this is analogous to my explanation. The 'u' you see here is the same as the unknown number of books
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