Find the least square number which is exactly divisible by each of the number 8 12 15 20(Answer in steps pls..)

Mary used 1/7 of a spool of ribbon to complete 4 projects. she used the same amount of ribbon on each project. how much ribbon did she use on each project?

Afarmer sells 9.5 kilograms of apples and pears at the farmer's market. 4/5 of the weight is the apples and the rest is the pears. how many kilograms of pears did she sell at the farmers market

What is the 12th term of b(n)=-4-2(n-1)