P5/P6 Math: Fractional Decrease of 2 parties of Equal Starting Ratio with Ending Difference Given

This question presents itself with 2 parties having equal ratio at first and both parties undergo difference fractional decrease. The difference at the end is also given.

Such questions are common in Paper 2 of P5 and P6 test/exam papers.
Calculator usage is allowed.

Pravin and Gary are postal delivery staff and 
have the equal number of packages to deliver in the morning.
By noon, Pravin has delivered 3/4 of his packages and
Gary has delivered 6/7 of his packages.
Pravin has 24 more undelivered packages than Gary.

How many packages did both have altogether in the morning at first?


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