Thanks Zhong Shu Hao can pls show me the workings too?

Just find the value of 1 unit from here.....

1 u ->68-23=45 John->45x2=90 is this correct?

yup

Thanks :-)

Hi Raymond Ng, thanks! But shouldn't it be 4/9?

Thank you very much, Raymond Ng!

The shaded area is the area of 4 full circles. 4 × pi × 10 × 10 = 1256.64 sq metres Below is another possible rearrangement.

Hi Xavier Sng, thanks a lot! Your explanations are very clear.

Xavier the master of visuals. Very impressive as always. I see till my eyes are crossed.

The pleasure is all mine, Joanne. Regards

Mister Yeo, I wish I were but I know better lol. Thank you once again for your most flattering words. I trust that you will know what are the essentials to seek for when you encounter the next question, and nail it good. You may prove to be the real McCoy in due course, Sir.

This is a problem that can be solved by working backwards.. We will consider the first transfer as when Ahmad gave 40% of his stamps to Bala while the second transfer as when Bala gave 50% of his stamps to Ahmad.. In the end Ahmad had 150 more than Bala. If you draw a model for that, Bala has 1 unit while Ahmad has 1 unit + 150.. This model is a result of the second transfer (Since we are working backwards).. However, before the situation became like that, Bala gave 50% of his stamps to Ahmad which means that the number of stamps left with Bala in the end is 50% also. Since Bala has 1 unit left and it is 50%, then we can say that before Bala gave the stamps to Ahmad, Bala had 2 units. Which means that the 1 unit that Ahmad owns in the end came from Bala. So before the second transfer, Ahmad had 150 stamps while Bala had 2 units. But before the second transfer, Ahmad gave Bala 40% of his stamps which means that Ahmad had 60% of his original number of stamps left. Since Ahmad is left with 150 stamps, 60% of Ahmad's stamps must be 150 making his original number of stamps, 250..

Thanks.

Hope it helps.. :)

Let Bala have 100u at First Ahmad will have 100u+120 Step1 After Ahmad give 40% to Bala Ahmad-60u+72 Bala-- 140u+48 Step 2 After Bala give 50% to Ahmad Ahmad-60u+70u+72+24= 130u+96 Bala-70u+24 Since Bala had 150 more than Ahmad-- 130u+96=70u+24+150 60u=174-96=78. u=1.3 AtFirst Ahmad have 100u+120 ------ 100x1.3 +120= 130+120 ---------== 250(answer)

Aishwarya Karthik.. I am working from the front.. Total is unchanged at all steps atFirst 100u+100u+120 =200u+120 Step 1 60u+72+140u+48= 200u+120 Step2 130u+96+70u+24= 200u+120