Kilogram is an SI unit for mass.
Ounce and pound refer to American system for measuring things, and decakilogram is not the "basic" unit, but kilogram is.
The.you.are.looking.for.is.C
The way i do it, is sort of like this :
Is 7 a factor of 42?
Is 5 a factor of 42?
7 is a factor of 42.
It must be in multiples of 7!
Therefore, we have 5 on the other side, which makes it 5 x 7 = 35
Answer:

Step-by-step explanation:
To calculate an area of a rectangle, use the formula A=l*w. We know the width is 7m greater than the length. So w = 7 + x. So the area is A= (7+x)*x.
We also know the area is 170. Substitute this value for A and solve.
Answer:
25 litres
Step-by-step explanation:
1 day = 5 litres
5 days = 25 litres