35% of what number of 42? plz explain

35% of 120 is 42. You can find this by taking 42 and dividing it by 0.35 (the decimal form of 35%). This will give you 120, which is the number that 42 is 35% of. You can double-check your answer by taking 120 and multiplying it by 0.35, which is how you find the value of a percentage of a number. That sounds confusing when I explain it, but it's pretty simple.

120 is your answer.