what is the smallest number which when increased by 3 is divisible by 9 , 35 , 25 and 21 ?
"when increased by 3 , the number must include at least 3 ^ 2 * 5 ^ 2 * 7 = 1575 the answer is a ."
add(lcm(lcm(9, 35), lcm(25, 21)), 3)