IDNStudy.com, ang iyong destinasyon para sa mga maaasahang sagot. Ang aming platform ng tanong at sagot ay idinisenyo upang magbigay ng mabilis at eksaktong sagot sa lahat ng iyong mga tanong.

1. One number is twice another. The sum of the reciprocal is 9/2 . Find the two numbers. 
2. A boat travels 30 miles up a river in the same amount of time it takes to travel 50 miles down the same river. If the current is 5 mph, what is the speed of the boat in still water?


Sagot :

1. Let a=1st no. and b=2nd no. One number is twice another means "a=2(b)"..The sum of the reciprocal is 9/2 means "1/a + 1/b = 9/2".. To find the value of b, we substitute eq.1 to eq.2... So, 1/2(b) + 1/b =9/2,.. Solving this,..3/2b = 9/2... 6=18b... b=1/3... Next is the value of a... a=2(b)....a=2(1/3)...a=2/3.. Therefore the two numbers are 1/3 and 2/3. 2.