Coloured teacups

The teacups in Tea Stop 55 are `2/5` green and `3/10` yellow. What fraction of the teacups are neither green nor yellow?

Correct answer:

x =  0.3

Step-by-step explanation:

g=25=0.4 y=310=0.3  x=1gy=10.40.3=310=0.3

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