fizu095

whats the 1+1

Three bakeries had a total of 380 cupcakes at first.
Bakery A sold 1/2 of its cupcakes. Bakery B sold 2/3 of its cupcakes and Bakery C sold 4/5 of its cupcakes. They sold the same number of cupcakes. How many cupcakes did each bakery sell?

A sample of natural gas is 85.2% methane, CH4, and 14.8% ethane, C2H6, by mass. What is the density of this mixture at 18°C and 771 mmHg?

There are red, blue and yellow-coloured balls in a box. Half of the balls are red. There are 12 blue balls and three times as many yellow balls as blue balls. How many balis are there altogether?

Find the work W done by the 30 Newton force acting at an angle 60 degrees from the horizontal to move a block horizontally by 150 meters.

A weight of 20 tonnes is supported by three short pillars,each 5cm2.in section.the the central pillar is of steel and the outer ones are of copper. The pillars are so adjusted that at a temperature of 15°Ceach carries equal load. The temperature is then raised to 115°C . Estimate the stress in each pillar at 15°C and 115°C. Take Es=2*10^6kg/cm2;alpha s =12*10^-6/°C and alpha c =18.5*10^-6/°C