Number of Notepads that Mrs Payne needs to buy=35
She can buy them in a pack of 10 or in Single Pads.
Number of Different Ways by which Mrs.Wayne can buy 35 Notepads
A =10 × 3 +1 × 5
B =10 × 2 +1 × 15
C =10×1 +1×25
D =1×35
=4 Ways
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