Can someone please help me like fast??

Find three consecutive numbers such that the sum of one-fourth the first and one-fifth the second is five less than one-seventh the third

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Adele is five years older than timothy. in three years, timothy will be 2/3 of adele’s age. what is adele‘s current age?