There is a string of red and blue lights strung around a window. the red lights blink every 3 seconds , and the blue lights blink every 5 seconds. how many times will they blink at the same time in one minute? ? show work

Onnie is considering doing some long term investing with money that she inherited. she would like to have $50,000 at the end of 30 years. approximately how much money would lonnie need to put into an account earning 6% interest compounded annually in order to meet her goal?