Insects:12/(1.5-1) = 24 pieces.
Plants: 12+24=36 pieces.
2. Build a road, 30 meters in the first week, 50 meters in the second week, leaving 20 meters. What percentage of the total length is left?
Full length: 30+50+20 = 100m.
Remaining full length: 20/ 100=20%
fill-in-the-blank question
1.20 tons of soybean can squeeze out 3 tons of oil. To extract 9/8 tons of oil, 7.5 tons of soybeans are needed.
(9/8)/3 *20=7.5 tons
2. A rectangular pool, 5 meters long, 4 meters wide and 2 meters deep, with 32 cubic meters of water in it, with a water depth of (1.6) meters.
32/(5 * 4) = 1.6m
The quotient of a divided by b is 5.5, and the ratio of a to b is (5.5).
4.A number is two thirds of B number, and B number is what percentage of A number? What is the score of A in the sum of A and B?
If b is 1, then a is 2/3.
The number B is the number A: 1/(2/3)= 150%.
The number A accounts for the sum of two numbers: (2/3)/(2/3+ 1)=2/5.
What is the salt content of 5.20 grams of salt in 30 grams of water?
20/(20+30)=40%
4. The ratio of the length, width and height of a cuboid is 6: 3: 2, and the sum of the sides is 88 cm, so the bottom area of this cuboid is ().
The sum of length, width and height is: 88/4=22 cm.
6+3+2= 1 1 copy
Each serving: 22/ 1 1 = 2cm.
Length: 2× 6 = 12cm
Width: 2×3=6 cm
Height: 2× 2 = 4cm
Bottom area: 12×6=72 cm2.
Operational problem
A rectangle should be divided into two parts, so that one part accounts for 37.5% of the whole rectangle area. How to divide it? Draw it.
37.5%=3/8
Divide the rectangle into eight parts and take three of them.
Connect the midpoint of two groups of opposite sides and connect two diagonal lines.
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