Question

بدین معنی که 6 درصد سیمان مقاومت خاک را تا سه برابر تا 28 روز افزایش می دهد

Answer 1

i.e. the addition of 6% cement triply improves the soil resistance for 28 days.

i.e. the addition of 6% cement improves the soil resistance for 28 days by three times as much as before.