The game of Nudge is played with a set of 15 pieces called 'bumps! Some bumps weigh 15 g, some weigh 30 g and some weigh 40g A full set of bumps has a total weight of 420 g and contains a different number of each type.
How many 30 g bumps are there in a full set of 15 bumps

The sum of the reciprocal of a positive number and the reciprocal of 2 more than the number is 3/4 equation: the number is

The sum of two numbers is 12 and their difference is 18 what are the two numbers

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?