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Joy Ho

Asked 9 years ago

SG Primary 5 Number and Algebra

Can someone help? P5 question

Replies 5

Yang Jie Hammy

Are there any errors in the question? Logically speaking, Total for Tom remains unchanged. Just look at 1/5 as a fraction and make Tom in both ratios to be the same number (finding common factors) However, the maths don't add up. Please correct me if I'm wrong.

6 years ago

Joy Ho

Sorry it was supposed to be 2:25

6 years ago

Joy Ho

Or something like that

6 years ago

Yang Jie Hammy

😅 it would be hard to get the answer if that's the case! Anyway, for this type of ratio question, it is classified under 'One part remain unchanged'. Hence, to solve this question, just need to make the one part into the same number. The rest would just be doing the maths :) hope that helps!

6 years ago

Yang Jie Hammy

Of course, if you are looking for the solution, (assuming 2:25 is accurate) read on below. He:Tom 1:5 = 5:25 (since Tom's total remains unchanged) 5u - 2u = 3u 3u -> 3 1u -> 1 Since he will have 2u 'if he loses one marble', he will have 3u which means he have 3 marbles.

6 years ago