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primary 5 | Maths | Percentage
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Tsl
Tsl

primary 5 chevron_right Maths chevron_right Percentage chevron_right Singapore

Kindly help me this math question. Thank you

Date Posted: 3 weeks ago
Views: 13

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40% is basically 2/5. This means we can let pages read be 2 units, and pages not read be 5 units.
Total pages in book = 2 + 5 = 7 units
Read pages = 2/7 of total pages
60% of the book is 3/5 of the book.
That's 3 units out of 5 units.

Now, the total number of pages is the same so the total number of units is also the same. We make them the same by changing the denominator to the same one.
The common multiple of 7 and 5 is 35
(7 x 5 = 35, 5 x 7 = 35)
Multiply both numerator and denominator by 5, 2/7 = 10/35
Multiply both numerator and denominator by 7, 3/5 = 21/35
We can now conclude that at first, 10 units of pages were read. Then after 22 more pages were read, total read pages increased to 21 units. And there are 35 units of pages in total.
21 units - 10 units = 11 units
So 11 units = 22 pages
1 unit = 22 pages ÷ 11 = 2 pages
Total pages = 35 units
= 35 x 2 pages
= 70 pages
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J
J's answer
191 answers (A Helpful Person)
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Tsl
Tsl
3 weeks ago
Thank you very much for your help.
Tsl
Tsl
3 weeks ago
Thank you very much for your explanation and the step you provide is easy to understand.
J
J
3 weeks ago
Welcome