**There were some marbles in a box. Sofie took out 2/5 of the marbles and put in 6 more. Then John took out 1/6 of the remaining marbles and put in 5 more. there were 25 marbles left. How many marbles were in the box at first?Solution**

6 units - 1 unit + 6 - 1 + 5 --> 25 (left in box)

5 units + 10 --> 25

5 units --> 25 - 10 = 15

1 unit --> 15 divided by 5 = 3

Marbles at first

--> 10 units x 3

= 30

(At first, there were 10 units and not 5 units because the 5 units have been cut into halves, giving a total of 10 smaller units)

Answer: 30 marbles

Answer: 30 marbles

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