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Sister can bake 50 cakes in 25 hours, Sister and Mummy together can bake 75 cakes in 15 hours. How many cakes Mummy can bake in 15 hours?
Cakes baked by Sister in 1 hour = $$\frac{50}{25} = 2$$
Cakes baked by Sister and Mummy together in 1 hour = $$\frac{75}{15} = 5$$
=> Cakes baked by Mummy in 1 hour = 5 - 2 = 3
$$\therefore$$ Cakes baked by Mummy in 15 hours = 15 $$\times$$ 3 = 45
=> Ans - (B)
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