Brinell Hardness

If a plain carbon steel test specimen has a Brinell hardness of 10, estimate the tensile strength in MPa.

Hint
The relationship between hardness and tensile strength is roughly:
$$$TS\:(MPa)\simeq 3.5\:HB$$$
where $$TS$$ is the tensile strength in MPa, and $$HB$$ is the Brinell hardness number.
Hint 2
Multiply the Brinell hardness number in the problem statement by 3.5.
For plain carbon steels, the relationship between hardness and tensile strength is roughly:
$$$TS\:(MPa)\simeq 3.5\:HB$$$
where $$TS$$ is the tensile strength in MPa, and $$HB$$ is the Brinell hardness number.
$$$TS\simeq 3.5(10)MPa\simeq 35\:MPa$$$
Note the units for HB are in psi or kg/mm^2 (Pascals), but the results are usually reported unitless.
$$$\simeq 35\:MPa$$$