Henry and Marcos started their weekend chores at 1:15 p. m. Henry finished his chores in 90 minutes. Marcos finished his chores 10 minutes sooner than Henry

At the many chips cookie company they are serious about the number of chocolate chips in their cookies they claim that each cookie hasn't c chips. if their claim is true there will be 200 chips in 10 cookies

Offering 30 if a plus b plus c equals 68 and ab plus bc plus ca equals 1121, where a, b, and c are all prime numbers, find the value of abc. the answer is 1978 but i need an explanation on how to get that.

Prove that the value of the expression 7^8–7^7+7^6 is divisible by 43.