be0ckie3syoujennaro be0ckie3syoujennaro

19-10-2016
Mathematics

contestada

The tens digit of a two digit number excedds the unit digit by 5 . if they are reversed b the new number is less by 45. if the v sum of their digits is 9 find the numbers

Respuesta :

apologiabiology apologiabiology

25-10-2016

x and y are digts
x is tens y is ones

x=y+5

10y+x=10x+y-45
x+y=9

we have
x+y=9
x=y+5
sub
y+5+y=9
2y+5=9
minus 5
2y=4
divide 2
y=2

sub back
x=y+5
x=2+5
x=7

the number is 72

Answer Link

Otras preguntas

how do i write a myth?

Mosaics are constructed from small pieces of stone called what?

Yesterday we combined Hydrochloric Acid HCl with Sodium Hydroxide NaOH in a violent reaction that resulted in water H2O and common table salt NaCl. How many gra

which is more important,friendship or justice

what is a weasel word?

A man wishes to cover his ﬂoor with tiles, each one measuring 3/4 inch by 2 inches. If his room is a rectangle, measuring 12 feet by 18 feet, how many such ti

what is a false analogy fallacy?

what are the north germanic languages?

Find the vertex, focus, and directrix. y = 1/24(x+1)² - 3.

If 5x + 15 is greater than 20, which of the following best describes possible values of x ?a) x > 5, b) x > 3, c) x > 1, d) x < 5, e) x < 1