The number of days left in the month of September are double the number of days already passed. How many days have already passed in the month of September?

In a community, two neighbours have rectangular backyards having the same area of 1350 sq. meter. If the width of first backyard is 9 meter and the width of second backyard is 45 meters, find which backyard will require more fencing and by how much?

The weight of cylinder filled with gas is ^@35 \space kg^@. If the weight of the empty cylinder is ^@ 13 \space
kg \space 100 \ g^@, find the weight of the gas contained in it.