George entered a jump rope competition. on saturday, he practiced jumping rope 9 different times for 3 minutes each time. he used the expression 9 × 3 to determine how many minutes he spent practicing altogether.

how many minutes did george practice jumping rope all together?
a) 6
b) 12
c) 18
d) 27

Acompany manufactures three types of cabinets. it makes 110 cabinets each week. in the first week, the sum of the number of type-1 cabinets and twice the number of type-2 cabinets produced was 10 more than the number of type-3 cabinets produced. the next week, the number of type-1 cabinets produced was three times more than in the first week, no type-2 cabinets were produced, and the number of type-3 cabinets produced was the same as in the previous week.