raishankalpapcfdp5 raishankalpapcfdp5

25-07-2018
Mathematics

contestada

the sum of present ages of mother and a daughter is 60 years. after 10 years,the product of their ages will be 1500. find their present qges.

Respuesta :

sadlerkiley sadlerkiley

25-07-2018

Let M and D be the current ages of mother and daughter.

M+D=60 and (M+10)(D+10)=1500.

MD+10(M+D)+100=1500, MD+600+100=1500, so MD=800.

Also, M(60-M)=800, 60M-M^2=800, M^2-60M+800=0=(M-40)(M-20) therefore M=40 (older than daughter) and D=20.

Answer Link

Otras preguntas

Water seeping into gravel, freezing, expanding, and cracking rock is an example of what? A. transportation of weathered material B. physical weathering C. erosi

Work out the volume of a cube of edge 5cm

what is the unit of analysis

where are 75% of the earth's volcanoes located?

apa kepanjangan dari BPUPKI

80% of what # is 32 games

Which words in the sentence are the complete adjective clause? Ask him to tell the story, which is about wild ponies. a. ask him b. which is about wild ponies

A sound wave that has a wavelength of 2 m in room-temperature air has a frequency of about A. 170 Hz. B. 1360 Hz. C. 2040 Hz. D. none of the above

Briefly explain the causes and the effects of the Spanish-American War.

Amy raises $58.75 to participate in a walk a thon. Jeremy raises $23.250more than Amy. Oscar raises 3 times as much as Jeremy. How much money does Oscar raise.