Answer:
1. Kian= 24 yrs old and Xhendric= 12 yrs old
2. the numbers are 42 and 39
Step-by-step explanation:
1. Let x be the age of Xhendric ( since he is the youngest).
Xhendric= x Kian = 2x (because he is twice the age of Xhendric)
Kian's Age + Xhendric's Age = 36
2x + x = 36
3x = 36
3x/3 = 36/3 (to get the value of x we must divide both side by 3)
x= 12
Xhendric = (x)= 12 yrs old Kian = 2(12) = 24 yrs old
2. Let x be the smaller number
Bigger number: x+3 Smaller number: x
x + (x+3) = 81
2x+3 = 81
to get the value of x we must first eliminate all numbers beside x, which is +3. to eliminate it we must transpose or move it to the other side of the equation, beside 81.
2x = 81-3
( when we transpose a number their sign changes if its positive it becomes negative and if its negative it becomes positive.)
2x = 78 ( To get the value of x, we must divide both sides by 2)
2x/2 =78/2
x= 39
Bigger number : x + 3 = (39)+ 3 = 42
Smaller number: x = 39
42+39 = 81
