Fractions in PHP

PHP also supports decimal fractions. In them, the integer and fractional parts are separated by a dot. See the example:

php<?php
  $a = 0.5;
  echo $a; // outputs 0.5
?>

See another example:

php<?php
  $a = 0.5 + 0.5;
  echo $a; // outputs 1
?>

Задание 1

Store the number 1.5 in the variable $a, and the number 0.75 in the variable $b. Find the sum of the values of these variables and output it to the screen.