Mandy collected 4 times as many shells as cameron. together they collected 40 shells. how many shells did mandy collect. write an equation and solve

Problem melissa is her dad build a walkway in their backyard. the walkway will be 54 feet long and 1.5 feet wide. the local hardware store sells tiles which are 1.5 by 1.5 feet and come in boxes of 12. how many boxes of tiles do they need?

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?

Write an inequality for this description. - one fourth of the opposite of the difference of five and a number is less than twenty.