Let the number of bricks be equal to x of dimension 22.5 cm x 10 cm x 7.5 cm which can be painted out of the given container.
Surface area of 1 brick
= 2(l x b + b x h + h x l)
= 2(22.5 x 10 + 10 x 7.5 + 7.5 x 22.5) cm2
= 2(225 + 75 + 168.75) cm2
= 2 x 468.75 cm2
= 937.5 cm2
According to question
x x 937.5 cm2 = 9.375 m2
1 m2 = 10000 cm2
⇒ x x 937.5 cm2 = 9.375 x 10000 cm2
⇒ x = \(\frac { 9.375\times10000 }{ 937.5 }\)
⇒ x = 100
Hence, required number of bricks = 100.