Making equation let A for Apple, B for Banana and G for Grape,

A + G + 2B = 210

ans condition is B =< G =< A

range is [ 30, 90 ]

So total possible solutions which staisfies the condition and equation both will be 6

(1) A = 90 , B = 30 , G = 60

(2) A = 80 , B = 30 , G = 70

(3) A = 90 , B = 40 , G = 40

(4) A = 80 , B = 40 , G = 50

(5) A = 70 , B = 40 , G = 60

(6) A = 60 , B = 50 , G = 50