Question

all questions I will give 20 points..

Answer 1

1) let the number be x
other number=3x
3x+x=16
x=4
the number are 4, 12
2) let the first number be x and second one is y
x+y=6 ............ (1)
x-y=4 ............(2)
add (1) &(2) we get
2x=10
x=5
y=1
so the numbers are 5&1
3) let the units pace number be x &tens place be y
number=10y+x
by inter changing the number we get
10x+y
(10x+y) -(10y+x) =45
9y-9x=45
y-x=5 ................. (1)
y+x=13 .................. (2)
add (1) &(2)
2y=18
y=9
x=4
so the number is 94
4) same as above
5) let the units place of number be x and tens place of number be y
the number become=10y+x
by interchanging the digit we get the number 10x+y
10y+x+10x+y=121
11y+11x=121
y+x=11 .......... (1)
y-x=3 ........... (2)
add 1 and 2
2y=14
y=7
x=4
so number is 74
6) second part is not in pic

Answer 2

Water is wet, in the sense of being a liquid which flows easily, because its viscosity is low, which is because its molecules are rather loosely joined together.