P5/P6 Math: Percentage of 2 Totals ( Equal at the End )

This question type shows that 2 unequal quantities undergo percentage decrease.
The quantity left after the percentage decrease is equal to each other.

Such question resembles "Fractions of Equal Value" and there are similar questions using "Percentage" to represent the fractions of equal value here.

Such questions usually appear in SA2 of P5 and also in P6 Paper 2.
Calculator usage is allowed.

Mr Rahim has 250 more laptops than smartphones for sale.
After selling 70% of the laptops and 20% of the smartphones,
he has the same number of laptops and smartphones left.

How many smartphones and laptops altogether does he have for sale at first?



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