A simple calculation of 7 out of 18 plus 5 out of 9 plus 7 out of 35 We're running out of time

A simple calculation of 7 out of 18 plus 5 out of 9 plus 7 out of 35 We're running out of time

(7 / 18 + 5 / 9) × 7 / 35
= 7 / 18 × 7 / 35 + 5 / 9 × 7 / 35
= 7 out of 90 + 1 out of 9
= 17 out of 90

If you can calculate simply, you can calculate simply 5 / 9 △ 5-1 / 18

=1/9-1/18
=2/18-1/18
=1/18

Simple calculation of 1 / 5 * 48 + 2 / 5 * 18

Simple calculation of 1 / 5 * 48 + 2 / 5 * 18
The results are as follows
==48*1/5+2*18*1/5
==(48+36)*1/5
==84*0.2
==16.8

5 out of 3-8 / 25 out of 36-1 out of 10

5 / 3-8 / 25 / 36-1 / 10
=9 out of 3-10 to 1 out of 10
=3-（9/10+1/10）
=3-1
=2