The ratio of the present ages of a son and his father = 3:7 His mother and father = 6:7 Father : Mother = 7:6 Son : Father = 3:7 Son : Father : Mother = 3:7:6 4 years ago, Son : mother = 1:4 Let the age of son = 3x Father = 7x Mother = 6x `(3x-4)/(6x-4)` =`1/4` 12x - 16 = 6x- 4 12x- 6x= - 4 +16 6x= 12 x = 2 Present age of son = 3 × 2 = 6 years
The chemical name of'Common salt’
Milk tastes sour when kept in the open for sometimes due to the formation of-
The gas usually causing explosions in coal mines is-
___________ is the process in which acids and bases react to form salts and water.
The most reactive among the halogens is-
The gas used for filling weather balloons is-
The major component of honey is-
The important ore of aluminium is-
Petroleum is a mixture of-
Manganite is an ore/mineral of
