(1) how much less is one tenth of a meter than one eighth of a meter? (2) how much is six tons more than four tons? (3) what is 0.048 expressed as a fraction? What is it expressed as a percentage? (4) 450 trees have been planted in the school, but 50 trees have not. What is the survival rate? (5) whose 25% is 5? 80% of 15 is equal to 2 of 3 of sound?

(1) how much less is one tenth of a meter than one eighth of a meter? (2) how much is six tons more than four tons? (3) what is 0.048 expressed as a fraction? What is it expressed as a percentage? (4) 450 trees have been planted in the school, but 50 trees have not. What is the survival rate? (5) whose 25% is 5? 80% of 15 is equal to 2 of 3 of sound?

(1)20%
(2)50%
(3)6/125
(4)90%
(5)20
eighteen
Ask me again if you don't

The front of a building is a trapezoid. How big is the area? (the upper bottom is 47m, the lower bottom is 71m and the height is 13m)
The top side of the building is a 15 meter, 2 meter triangle. What's the area?
What's the area of the brick on the roof?

1、S=（47+71）13÷2=767(m^2)
2、S=15×13.2÷2=99（m^2）
No data

An integer has the following characteristics: 1. The point he represents on the number axis is on the left side of the original; 2. His opposite number is smaller than two. What is this number?

-1