6.40 litres of air contains 5.00 litres of nitrogen and 1.34 litres of oxygen.

Work out the percentage of air that is:

a. nitrogen b. oxygen c. other gases

A towel has a pattern of 2 green stripes 3 blue stripes and 1 yellow stripe. If the towel had 20 stripes altogether, how many blue stripes are on it?

The surface area of 10ft 7ft 10ft

In 1906 Americans consumed an average of 26.85 gallons of whole milk per year. By 1998 the average consumption was 8.32 gallons. What is the percent decrease in consumption of whole milk?

The Hu family goes out for lunch, and the price of the meal is $58. The sales tax on the meal is 7%, and the family also leaves a 20% tip on the pre-tax amount. What is the total cost of the meal?

How much water is needed to completely fill a mini-aquarium measuring 20 cm x 35 cm x 50 cm?

if the farm has 30 chickens and cows and there are 82 chickens and cow legs all together how many cows would the farm have?

The graph of y=3x is shown. What is the value of x when y=27? A. 2 B. 3 C. 9 D. 24

What is the probability of spinning yellow

Verify each trigonometric equation by substituting identities to match the right hand side of the equation to the left hand side of the equation 4. sine of x divided by one minus cosine of x + sine of x divided by one minus cosine of x = 2 csc x

A total of 598 tickets were sold for the school play. They were either adult tickets or student tickets. There were 52 fewer student tickets sold than adult tickets. How many adult tickets were sold?