MATH (CE 1C)

Engineering Board Exam: Ibarra is 15 years older than his girlfriend Clara. How ever 'y' year/s ago, Ibarra was twice as old as Clara. If Clara is now 'b' years old, find the value of (b-y)?

Engineering Board Exam: Five years ago, Toni was five times as old as Alex. In

six years, Toni will be three times as old as Alex. What

is the past age of Toni?

Mccoy is one-forth as old as Elisse and four years younger than Felize. The sum of their ages is 40 years. How old is Felize?

Juan has to mix together two kinds of coffee beans. Mocha Madness, which costs ₱200 per kilograms, and Sumatra Sweetness, which costs ₱120 per kilogram - to produce sixty kilograms of a coffee that costs ₱140 per kilogram. The beans in the mixture sell for the same price as they would separately.

How many pounds of Sumatra Sweetness will Juan put into the mixture?

What will be the time after 5:00 o'clock will the hands of the clock be at 60° for the second time?

What will be the time after 8:00 o'clock will the hands of the clock be at 45° for the first time?

Two thousand kilograms of steel containing of 8% nickel is to be made by mixing a steel containing 14% nickel with another containing 6% nickel. How much of 14% of nickel is needed?

How much water must be evaporated from 12 liters solution which has 7% salt to make a solution of 15% salt?