A 20-pound block of clay was cut into 6 pieces that each weighed the same amount. What was the weight of each piece?

Twice the sum of a number and 4 is equal to three times the difference of the number and 7. find the number.

What expression is equivalent to 42x-56y

Tod does not have any cookies. david gives jeff 8 cookies. then he splits half of the cookies he has left with tod. david let’s c represent the number of cookies that he starts with. he finds the number of cookies that tod has is 1/2 the difference of c and 8. write an expression to represent the number of cookies that tod has.