Foundation January 2019 Paper 1R Q10

10 There are 20 beads in a box.

7 of the beads are red.
11 of the beads are green.
The rest of the beads are yellow.

Jan takes at random a bead from the box.

There are 26 counters in a bag.

5 of the counters are pink.
10 of the counters are blue.
The rest of the counters are white.

Jan puts some more pink counters into the bag.
She then takes some blue counters out of the bag.
After she has done this there are still 26 counters in the bag.

Jan then takes at random a counter from the bag.

The probability that she takes a pink counter is \(\dfrac{1}{2}\)