How to calculate 34 × (1 / 17 + 1 / 19) × 19 and 3 / 5 + [(1 / 5 + 1 / 3) △ 2 / 9]

How to calculate 34 × (1 / 17 + 1 / 19) × 19 and 3 / 5 + [(1 / 5 + 1 / 3) △ 2 / 9]

How to calculate
34×（1/17+1/19）×19
The results are as follows
==19*34*1/17+19*34*1/19
==19*2+34
==38+34
==72
3/5+[（1/5+1/3）÷2/9]
The results are as follows
==3/5+8/15*9/2
==3/5+12/5
==15/5
==3

One in six: two in five equals one in two
Solution ratio,

（1/6）：（2/5）=x/2
That is, (1 / 6) / (2 / 5) = x / 2
Multiply both sides by 4 / 5 to get 1 / 3 = 2x / 5
Multiply 15 on both sides to get 6x = 5
Divide both sides by 6 to get x = 5 / 6

Two and one in eight equals one and how many?

1 and 9 / 8

1 / 2 * 1 / 8 is equal to

One sixteenth