Mary has 689g of potatoes, 434.98g of cheese and 70.134g of butter. What is the weight in total? ( the answer is ... kg )

Brick is $28.25 per 25 kg. How much is 350 kg of brick.

There are 4n pebbles of weights 1, 2, 3, . . . , 4n. Each pebble is coloured in one of n colours and there are four pebbles of each colour. Show that we can arrange the pebbles into two piles so that the following two conditions are both satisfied:

• The total weights of both piles are the same.

• Each pile contains two pebbles of each colour.

There are 48 students in a class. The ratio of the number of the girl students to the number of boy students is \(\frac{1}{3}\). How many girl students are there in the class? 

Given n=0.9 and m=7.02 .What is the value of B=\(\frac{2}{n}:\frac{3\times m}{n+m}\)

A cube with an edge of 7cm. Q :

a. What is the cubic volume ?

b. What is the area aroud the cube ?

c. What is the total area of the cube ?

The sum of denominator and numerator of a fraction is 91 and the fraction is equal to \(\frac{6}{7}\). The denominator of the fraction is 

John uses 1/3 of his land for growing apples, 1/4 for oranges, 1/5 for bananas and the remaining 13 hectares for flowers. The total area of his land is ... hectares.

1, Tìm x:

 x + x : 5 x7,5 + x : 2 x 9 = 315

2,Cho hình chữ nhật ABCD có diện tích = 108cm². Trên AB lấy E sao cho BE = \(\frac{1}{3}\)AB. Trên BC lấy F sao cho CF = \(\frac{1}{3}\)BC. Tính diện tích DEF.

3, James' age in 2008 was the sum of all the digits of his year of birth. How old James in 2008?