Question

16. Află numărul necunoscut:
91: = 31
25 ml: a = 5 ml
71x = 421
81x a = 561
38 ml + x = 60 ml
93.1 + x = 1001
425 ml - x = 137 ml
- 75 ml = 125 ml​

Answer 1

9: x=3
x=9:3
x=3

25:a=5
a=25:5
a=5

7xa=42
a=42:7
a=6

8xa=56
a=56:8
a=7