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Question

Answer

Cost of each plushie is twice the cost of each keychain.
2 keychains = 1 plushie
4 keychains = 2 plushies
4 keychains + 8 plushies = 10 plushies
1/4 ( = 2/8) of his money bought him 10 plushies
Remaining money = 8/8 – 2/8 = 6/8
1/2 of remaining money = 1/2 x 6/8 = 3/8
2/8 can buy 10 plushies
1/8 can buy 5
3/8 can buy 15
Mr Robins bought a total of (8 + 15) = 23 plushies

Essential
Which part of my working is wrong

You were almost there.
On the last step, you added 10p instead of 8p.
Remember that he didn’t actually buy 10 plushies at first. He bought 8 plushies + 4 keychains, which you equated to have the same cost as 10 plushies since cost of 1 plushie = cost of 2 keychains.
Essential
Thank u for the explanation . It’s clear now

