Question

Three brothers combine their money to buy their father a birthday gift. If each brother contributes fifteen dollars and one brother contributes an additional twenty-five dollars, how much money do they have for the gift? The expression is fifteen b plus twenty-five, where b represents the total number of brothers.

forty-three dollars

seventy dollars

ninety dollars

one hundred twenty dollars

Answer 1

(15)(3) + 25 = 70

The value for "b" is 3 because there are 3 brothers who are each contributing 15 dollars. The "+ 25" comes from one of the brothers contributing an extra 25.

Answer 2

So,

(15)(3) + 25 -> 45 + 25 -> 70