Five years ago the total sum of ages of father and son was 40. The ratio of their present age is 4:1 what is the present age of the father

How many grams must be adde to 970g to make 1 and a half kg

Omar is going on a road trip! the car rental company offers him two types of cars. each car has a fixed price, but he also needs to consider the cost of fuel. the first car costs $90 to rent, and because of its fuel consumption rate, there's an additional cost of s0.50 per kilometer driven.

How do you find principle and simple interest