If a number is increased by 1/4, it becomes 1.25. What is the original number? A. 1 B. 0.8 C. 1.2 D. 1.5 相关知识点: 试题来源: 解析 B。设原数为 x,x + 1/4x = 1.25,解得 x = 1.25÷(1 + 1/4)=1.25÷1.25=1,1 的 4/5 是 0.8。
代数式：x/3＋1
结果1 题目A number is increased by 50% and then decreased by 30%. What is the net increase or decrease? A. 15% increase B. 15% decrease C. 20% increase D. 20% decrease 相关知识点: 试题来源: 解析 A。假设这个数是100,增加50%后变为150,再减少30%变为105,所以是增加了5,5占100的...
结果1 题目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 ...
If a number is increased by 3 and the original number is 5, what is the new number? ___. A. 6 B. 7 C. 8 D. 9 相关知识点: 试题来源: 解析 C。解析:原数是5,增加3,即5 + 3 = 8,选项A“6”、选项B“7”和选项D“9”都不是正确结果,选项C“8”正确。反馈...
结果1 题目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...
结果1 题目If a number is increased by 20% and then decreased by 20%, what is the overall change? A. No change B. 4% decrease C. 4% increase D. 20% decrease 相关知识点: 试题来源: 解析 B。设这个数为 100,增加 20%后变为 120,再减少 20%,120×(1 - 20%) = 96,(100 - 96)...
A number is increased by 20% and then decreased by 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...
Greater than the original number C. 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 ...
结果1 题目A number is increased by 5 and the result is 15. What is the original number? A. 10 B. 11 C. 12 D. 13 相关知识点: 试题来源: 解析 A。设原数为 x,x + 5 = 15,解得 x = 10。B 选项 11 不符合;C 选项 12 不符合;D 选项 13 不符合。