<p>To solve the problem of a number being first increased by 10% and then reduced by 10%, let's follow these steps:</p><p><strong>Step 1: Define the original number</strong> Let the original number be \( x \). For simplicity, we can assume \( x = 100 \).
If a number is increased by 10 and then divided by 2, the result is 15. What is the number? A. 20 B. 25 C. 30 D. 35 相关知识点: 试题来源: 解析 A。设这个数为 x,(x+10)÷2=15,解得 x=20。B 选项 25 不符合;C 选项 30 和 D 选项 35 都不对。
The number of students in a school increased by 10%. There are now 550 students. How many students were there originally? A. 500 B. 450 C. 400 D. 350 相关知识点: 试题来源: 解析 A。设原来有 x 个学生,x 乘以(1 + 10%)等于 550,解得 x 等于 500。反馈 收藏 ...
3If the price of a product was first increased by 10% and then reduced by 10%, now the price of the product (C).(A) is the same as the original price(B) is 1% higher than the original price(C) is 1% less than the original price(D) cannot be determined 相关知识点: 试题来源...
If a number is increased by 20% and then decreased by 20%, the final number is what percentage of the original number? A. 96% B. 100% C. 104% D. 120% 相关知识点: 试题来源: 解析 A。本题考查数学推理中的百分比变化。设原数为 100,增加 20%后变为 120,再减少 20%,即 120 的 20...
What is the final percentage change compared to the original number? A. 4% decrease B. 4% increase C. No change D. 20% decrease 相关知识点: 试题来源: 解析 A。设这个数为 x,增加 20%后变为 1.2x,再减少 20%变为 1.2x×0.8 = 0.96x,所以相比原来减少了 4%。反馈 收藏 ...
If a number is increased by 20% and then decreased by 20%, what is the overall change? A. Decreased by 4% B. Increased by 4% C. No change D. Decreased by 20% 相关知识点: 试题来源: 解析 A。解析:设这个数为 100,增加 20%后是 120,再减少 20%是 120 乘以(1 - 20%)等于 96,...
Less than the original number D. Can't be determined 相关知识点: 试题来源: 解析 C。Let the original number be 100. Increased by 20%, it becomes 120. Then decreased by 20% of 120 which is 24. So the final number is 96 which is less than the original number....
A number is increased by 50% and the result is 150. What was the original number? A. 100 B. 120 C. 130 D. 140 相关知识点: 试题来源: 解析 A。解析:设原来的数为x,增加50%后的数就是x加上50%x,即x+0.5x = 1.5x。已知结果是150,那么1.5x = 150,x就等于150除以1.5,得到100,所以选...
If a number is increased by 20% and then the result is 60. What was the original number? A. 50 B. 48 C. 45 D. 40 相关知识点: 试题来源: 解析 A。解析:设原数为x,x乘以(1加20%)等于60,解得x等于50。本题考查数学中的方程思想和英语中百分数的表达。选项B、C、D不符合通过方程计算出...