Question

The paint in a certain container is sufficient to paint an area equal to 9.375 metre square.How many bricks of dimensions 22.5cm into 10 into 7.5 can be painted out of this container.​

Answer 1

given dimensions of a brick

l= 22.5cm b= 10cm h=7.5 cm

total surface area of bricks

=

$2(l \times b + b \times h + h \times l) \\ 2(22.5 \times 10 + 10 \times 7.5 + 7.5 \times 22.5) \\ 2(225 + 75 + 168.75) \\ 2 \times 468.75 {cm}^{2} = 937.5 {cm}^{2} \\ = \frac{937.5}{100 \times 100} {m}^{2} \: \: \: \: (1m = 100cm) \\ number \: of \: bicks \: that \: painted \: out \: of \: this \: container \: \\ = \frac{total \: surface \: area \: of \: container}{total \: surface \: area \: of \: bricks \: } \\ = 9.375 \div \frac{937.5}{100 \times 100} \\ = \frac{9.375 \times 100 \times 100}{937.5} \\ = \frac{937500}{9375} = 100.$

Answer 2

100 CM........ ..........