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Comments (3)
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Topic:Mathematics skills 35
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Trustin me
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Aug 2020
Trustin mesays...
The rate is one castle in three hours: 1/3
Multiply ratio by 4 to make numerator divisible into 4 equal parts: 4/12
Susan can build 4 times as fast therefore, Susan's rate is 3/12, while Jane's rate is 1/12:
(3/12 + 1/12 = 4/12)
In 1 hr Jane can build 1/12th of a sandcastle, therefore she needs 12 hours to build a complete sandcastle by herself.
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Comments (3)
The rate is one castle in three hours: 1/3
Multiply ratio by 4 to make numerator divisible into 4 equal parts: 4/12
Susan can build 4 times as fast therefore, Susan's rate is 3/12, while Jane's rate is 1/12:
(3/12 + 1/12 = 4/12)
In 1 hr Jane can build 1/12th of a sandcastle, therefore she needs 12 hours to build a complete sandcastle by herself.
Rate for both children is 1 job in 3 hours (1/3)
Susan's rate is three times that of Jane's rate
Jane's rate + Susan's rate = 1/3
r+3r =1/3
r=1/12
It would take Jane 12 hours to build one sandcastle
r+3r =1/3
r=1/12