Question

a number consist of two digits who sum is 9. if the digits reversd the new number is 3 apone 8 of the first number the number​

Answer 1

Answer:

let the digits are x and y

x+y=9

new numer is 10y+x

10y+x=3/8(10x+y)

Step-by-step explanation:

80y+8x=30x+3y

77y=22x

y=22x/77=2x/7

so x+2x/7=9

9x=9×7

x=7, y=9-7=2

so the number is 72