Respected sir/mam,
Kindly please explain me this word problem,
"Four-fifth of a no. is more than three-fourth of the no. by 8. Find the number."

Asked by ranksahoo | 27th Oct, 2017, 09:41: PM

Expert Answer:

begin mathsize 16px style Let space the space required space number space be space straight x.
Then comma
Four minus fifth space of space straight a space number equals 4 over 5 straight x
And comma space Three minus fourth space of space straight a space number equals 3 over 4 straight x
Thus comma space we space have
4 over 5 straight x minus 3 over 4 straight x equals 8
rightwards double arrow fraction numerator 4 straight x cross times 4 minus 3 straight x cross times 5 over denominator 4 cross times 5 end fraction equals 8
rightwards double arrow fraction numerator 16 straight x minus 15 straight x over denominator 20 end fraction equals 8
rightwards double arrow straight x over 20 equals 8
rightwards double arrow straight x equals 8 cross times 20
rightwards double arrow straight x equals 160
Hence comma space the space required space number space is space 160. end style

Answered by Rashmi Khot | 28th Oct, 2017, 10:05: AM

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