25-01-2015
Mathematics

contestada

the tens digit of a two digit number is twice the units digit. The sum of the digits is twelve. Find the original number.

Respuesta :

konrad509 konrad509

25-01-2015

x - tens digit
y - units digit

[tex]x=2y\\ x+y=12\\\\ 2y+y=12\\ 3y=12\\ y=4\\\\ x=2\cdot4\\ x=8\\\\ 10\cdot8+4=\boxed{84} [/tex]

Answer Link

Otras preguntas

a boat traveled at an average speed of 14.4 km/h for 3.5 hours. how far did the boat travel? use d=rt.

find the square root by factor 21904

what is the meaning of lit, as its used in this sentence.. It was in the clove of seasons, summer was dead but autumn had not yet been born, that the ibis lit i

is a rectangle a parallelogram yes or no explain your answer

Find the midpoint of the segment joining the points: (4, -2) and (-8, 6) Hint: Formula for midpoint is (x1+x2)/2, (y1+y2)/2

how high would a two story building be? what about a 10 story building?what about a 30 story building

Can some one please help me ???

how do you this 2 x 2 = 3 +

Which of the following is a strong electrolyte when it is mixed with water? (A) HNO₂ (B) KNO₃ (C) C₂H₅OH (D) CH₃COOH (E) NH₃

Solve (x+5)+4=16 by first subtracting 4 and then 5. Show your work and justify each step.