How many grams of ZNO shoulbe added to 30gms of 10%ZNO to get 15%oint

Mass of ZnO added=1.765 g

Given

30gms of 10%ZnO(Zinc oxide)

15% ZnO

Required

mass of ZnO added

Solution

Amount of ZnO in 30 gms of 10% ZnO =3 gms

For 15% ZnO : x= ZnO added

New solution = 30+x = 15%, so the equation :

b is the correct answer

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