the average age of an adult class is 40 years . 17 new students with an avg age of 32 years join the class . therefore decreasing the average by 4 year . find what was theoriginal strength of class ?
"let original strength = y then , 40 y + 17 x 32 = ( y + 17 ) x 36 â ‡ ’ 40 y + 544 = 36 y + 612 â ‡ ’ 4 y = 68 â ˆ ´ y = 17 d"
divide(subtract(multiply(17, subtract(40, 4)), multiply(17, 32)), 4)