Question

machine make 128 copies in 4 hours how many copies can it make in 7 hours if number of hours and the number of copies vary directly

Answer 1

224
copy in 1hour128/4=32
copy in 7 hour=224

Answer 2

simple if they vary directly this means 32 copies can be made in 1 hour so in 7 hours time we can make 7×32=224 copies. this is the answer .