Suppose ,

a number is decreased by =x%  and then again decreased by length  =y% Then,

net change  ={−x−y+(xy/100)} % = 28%

Let the speed of car be x kmph.

Therefore, the speed of train = 1.5x kmph

Distance traveled by train and car is same. Time difference is 12.5 minutes.

(75/x) - (75/1.5x) = (125/10x60)

x = 120

Let the speed of car be x kmph.

Therefore,

the speed of train = 1.5x kmph

Distance traveled by train and car is same. Time difference is 12.5 minutes.

(75/x) - (75/1.5x) = (125/10x60)

x = 120

10 men working 6 hours a day can complete a work in 18 days.  so no. of man work hours needed to complete the work is = 10x6x18 

so,when 15 men work, and should complete the work in 12 days,

let,

the no. of hours they work per day be h 

so for the work to be completed the man work hours will be the same  so,

15xhx12=10x6x18  so h=6  so they have to work for 6 hours a day to complete the work in 12 days  Ans:6

Let the whole number is X. Now, according to question, (6 -X) /(7 -X) < 16/21. 21 *(6 -X) < 16 *(7 -X)   126 - 21X < 112 - 16X 126 - 112 < - 16X + 21X 14 < 5X 5X  > 14 X > 2.8 So, Least such whole number would be 3.

Let the number of persons eligible to vote be x.

Then,

voters who voted for A = 30% of x.

Voters who voted for B = 60% of (70% of x).

                                         =  42% of x                                          =(60100∗70100∗100)% of x

                                          = 42% of x.

Voters who did not vote = [100 - (30 + 42)]% of x = 28% of x.

∴ 30% of x - 28% of x= 1200

=> 2% of x= 1200

=> x = {1200 X (100/2)} =60000.

বর্তমান বয়স ক হলে ৩ বছর পরে ক+৩ এবং ৩দিয়ে গুণ করলে হবে ৩(ক+৩) আবার এই বয়স থেকে বিয়োগ করতে হবে তিনবছর আগের বয়স ক -৩ এর ৩গুণ = ৩(ক-৩) তাহলে বর্তমান বয়স পাওয়া যাবে। প্রশ্ন মতে, ৩(ক+৩) -৩(ক-৩) = ক বা, ৩ক+৯ -৩ক +৯ = ক সুতরাং ক = ১৮ অর্থাৎ লোকটির বয়স ১৮ বছর।

Let,

the numbers be x and y.

Then,

2x + 3y = 39...(i)

and

3x + 2y = 30 ...(ii) On solving (i) and (ii), we get :  x = 6 and y = 9. larger number = 9

Present age of 5 members = 5 x 17 + 3 x 5 = 100 years Also, present ages of 5 members + Age of the baby = 6 x 17 = 102 years Age of the baby = 102 – 100 = 2 years.

x = y  <=> 1 - q =  2q  + 1  <=> 3q  = 0 <=> q = 0.