The child has done the correct 1st working by writing down the initial ratio. Next step is to understand the movement in terms of unit and write down. Then analyse information and last step is solving. Solving is almost never the first step.
F : G : H
At first 9 : 2 : 6
H gives 1/3 to G 9 : 2+2 : 6-2
comparing F is 9 units, G is 4 units,
Now, F has 5 units more = 665 more beads
1 unit —-> 133 beads
At first, F has 7 units more than G—-> 931 more beads#