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2014年9.20青海政法干警数量关系真题解析

2014年9.20青海政法干警数量关系真题解析
2014年9.20青海政法干警数量关系真题解析

61.【答案】A

【所属考试模块】数量运算

【考点】年龄问题

【难度系数】较易

【作者】肖超

【解析】此题中上一虎年与上上个虎年相差12年,年龄则相差12岁,两人和则相差24岁,可知上上个虎年的老王和小赵年龄和为30岁,又知老王年龄是小赵6倍多,易知两人年龄分别为26岁、4岁,则老王26岁为虎年,则出生时为鼠年,这道题选择A。

62.【答案】C

【所属考试模块】数量运算

【考点】工程问题

【难度系数】中等难度

【作者】肖超

【解析】此题典型的工程问题,可用方程法。假设A、B两队每天的量就为A、B,则易知B=A+3,总量为(A+B)*18,由其余条件可知,12A+17B是总量的5\6,易解得A=6,B=9,则总量为(6+9)*18=270,这道题选择C。

63.【答案】C

【所属考试模块】数量运算

【考点】几何问题

【难度系数】较简单

【作者】肖超

【解析】本题为几何问题当中的矩形面积求解,可用带入排除法、方程法来做。由题目易知长比宽多40米,路外周长为280米,可知路长为90米、宽为50米,则代入排除法,简单代入5米,则易知面积为280*5-5*5*4=1300,符合题意,选择C.方程法假设路宽为X,则易知280*X-X*X*4=1300,可解X=5,答案选择C.

64.【答案】A

【所属考试模块】数量运算

【考点】经济利润

【难度系数】较易

【作者】肖超

【解析】此题目为经济利润问题中的变形题目,由题意易知,题目最大优惠为买一送一,3件价格不同,又两件和为另一件2倍,每件不超过其余的2倍,可假设衣服价格分别为2,3,4.则A,全价买最贵4,送3,则2打7折,共4+2*0.7=5.4,B,全价买居中3,送2,4打7折,共3+4*0.7=5.8,C全价买最便宜2,不送,共2+(3+4)*0.7=6.9,D,全享7折共(2+3+4)*0.7=6.3,易知最优惠的为A

65.【答案】C

【所属考试模块】数量运算

【考点】溶液问题

【难度系数】简单

【作者】肖超

【解析】此题目为溶液问题的基本计算,假设甲乙丙三溶液中溶剂为甲乙丙,则溶剂=浓度*溶液,则甲+乙=(3+7)*50%=5,甲+丙=(3+9)*50%=6,乙+丙=(7+9)

*60%=9.6,易知甲+乙+丙=10.3,如果三种溶液混合共3+7+9=19,溶质为10.3,要想得到50%浓度,溶液为10.3\50%=20.6,所以需加水20.6-19=1.6公斤。因此答案选C.

66.【答案】D

【所属考试模块】数学运算

【考点】排列组合

【难度系数】中等

【作者】肖超

【解析】题目易知,新招5名新员工,男性比女性多1名,则男3,女2.将5

人分3部门,最多两人、至少一人,有两人性别不同,第一步既3名男性分别在三不同部门,则共3*2*1=6种情况,第二步将2女分别分至两部门,则由3*2=6种情况,分步乘法6*6=36,因此选择D

67.【答案】B

【所属考试模块】数学运算

【考点】经济利润中花费统筹

【难度系数】中等

【作者】肖超

【解析】本题易知三人钱数相同在100以内,甲=4*圆珠笔+15=乙=6*签字笔+21=丙=7*钢笔+17,由数字奇偶性推论,可知钢笔购买数量为偶数,则为2、4、6、8、10,依次代入可得钢笔10支,则每人87元,三人共87*3=261,购买最便宜的圆珠笔量最多261\4,取整为65

68.【答案】C

【所属考试模块】数学运算

【考点】方程类

【难度系数】基础题目

【作者】肖超

【解析】假设2011总人数为X,2012年为X+100,题意易知62%*X=57.2%*(X+100),容易解得X=1192,常驻人口1192*62%=739,所以答案选C

69.【答案】B

【所属考试模块】数学运算

【考点】平均数问题

【难度系数】中等

【作者】肖超

【解析】此题易知,赋值法,假设共5人,录取线为X人,则题目易知2*(x+7)+3*(x-13)=58*5,解X=63,所以选择B.

70.【答案】D

【所属考试模块】数学运算

【考点】经济利润问题

【难度系数】中等

【作者】肖超

【解析】此题可用代入排除法,A,若155元,则卖车数量为200-55\5*4=156,则收益为(155-20)*156,B,若165元,则卖车数量为200-65\5*4=148,则收益为(165-20)*148,C,若175元,则卖车数量为200-75\5*4=140,则收益为(175-20)*140,D,若185元,则卖车数量为200-85\5*4=132,则收益为(185-20)*132,比较四个大小,答案为D.也可用方程法,假设增加X个5元,则收益为(100+5*X-20)*(200-4*X)=16000+680*X-20*X*X,根据方程性质可知,当x=17时,收益最大,则此时费用为100+17*5=185

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