Question

the area of a trapazeuim is 279 sq cm and the distance between its 2 parallel sides is longer than by 5 cm find its length of 2 parallel el sides

Answer 1

Let one parallel side be x then another one is x+5
now, area=1/2 (sum of ll side)×height (distance)
279=1/2(x+x+5)×18
558=(2x+5)×18
31=(2x+5) 
2x=26