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Try to draw model for P4.

or, work with LCM units (LCM of 3 and 4 = 12 units  no change in Darren’s marble before and after)  

Darren has 3/5=12/20 of Aiman (Darren 12 units, Aiman 20 units).

Later, Aiman has 1/4=3/12 of Darren (Aiman 3 unit, Darren 12 units no change)

Aiman lost 20-3=17 units –> 102 marbles

                                   1 unit –> 102/17 = 6 marbles

Both (end) =3+12=15 units –> 90 marbles#

0 Replies 1 Like ✔Accepted Answer

At first —

Darren ——- 12u

Aiman ——- 20u

In the end —

Darren ——- 12u

Aiman ——- 3u

 

20u – 3u = 17u ——- 102

1u ——- 102/17 = 6

12u + 3u = 15u ——- 15 x 6 = 90

Ans : 90 marbles.

0 Replies 1 Like
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