A toy store buys red, blue, and green balloons. Red balloons account for (1/4) of the total number, blue balloons account for ((x)/5) of the total number (x is a natural number), and there are 28 green balloons. How many balloons are there in total?
玩具商店购进红、蓝、绿三种颜色的气球．红气球占总数的(1/4)，蓝气球占总数的((x)/5)(x为自然数)，绿气球有28个．三种气球共有多少个．
<result>80</result>