In a given class room, the number of girls is ten than the number of boys. If the ratio of the number of girls to number of boy is 7:5 then find the number of girls​

Will mark the brainliest. paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?