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Answer 1 · 2017-09-20T10:33:01

Apparently 2 pencils (=the difference between 7 and 5) cost $6 (which is expensive!!), so 1 pencil for $3.

Then 10 pencils will be $10.

Or:
#7p-5p=6->2p=6->p=6/2=3->10p=10xx3=30#

Answer 2 · 2017-09-20T10:35:39

# 10 # pencils cost Rs #30#

#7# pencils cost Rs #6# more than that of #5# pencils.

# :. 7-5 =2 # pencils cost Rs #6#

# :. 1 # pencil costs #6/2=# Rs #3#

# :. 10 # pencils cost #3*10=# Rs #30# [Ans]