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SOLUTION 1
We get this if we directly translate the problem into a model:

The key observation is that the total is 4u + 7u = 11u and so
after sharing, they will have 5.5u each.
Thus, Jane gave Siva 1.5u = 36 stickers so u = 36/1.5 = 24.
But P5 students may struggle with dividing by 1.5 so I prefer
Solution 2 below.

SOLUTION 2
4/7 = 8/14 so we scale up the units by 2 to draw this diagram instead:

 
The total number of stickers is 8u + 14u = 22u.
So after sharing, they both had 11u each.
Thus Jane gave Siva 11u - 8u = 3u = 36. This means u = 12.

a) Jane had 14u - 8u = 6u = 6 x 12 = 72 stickers more than Siva at first.
b) There were 22u = 22 x 12 = 264 sticks in all.
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