Pls help for part b.....thank you!!


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Hi wildcats,


PM’d u.

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Thank you for the very clear explanations speedmaths & Mathizzzfun!!

A, B, and C had some stamps in the ratio of 2:5:7. after they were given 8 stamps each, the ratio of the stamps they had became 10:19:25. Find the total number of stamps they had at first.




I solved this question using bags & boxes method, but the solution given had just three steps:


8 / 4 = 2
6+15+21=42
42x2=84

Can anyone help to explain the solution pls?

S-H:

cmm:

The teacher asked John if he had stolen Ali's wallet.

Why it is not: The teacher asked John if he stole Ali's wallet. Because I thought present tense changed to past tense while past tense then changed to past perfect tense. :?

This sentence is in past perfect tense. You can read it up here http://esl.fis.edu/grammar/rules/pastperf.htm.

The teacher asked John if he had stolen Ali’s wallet.

Thank you very very much MathIzzzFun!!!

Pls help.


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I have the solution as below:

480 / 4 = 120
480 - 120 = 360
360 / 4 = 90
360 + 90 = 450ml

Can anyone pls help explain the solution? TQ very much!!