Aspotlight at a dance club flashes every 25 seconds. another spotlight flashes every 30 seconds. both lights just flashed . after how many minutes will both lights flash at the same time again?

What numbers are included in the set of integers? what numbers are not included?

How many kilograms of a 5% salt solution and how many kilograms of a 15% salt solution must be mixed together to make 45kg of an 8% salt solution?

Avery’s piggy bank has 300 nickels, 450 pennies, and 150 dimes. she randomly picks three coins. each time she picks a coin, she makes a note of it and puts it back into the piggy bank before picking the next coin.