Problem Solving (PS) | In Ghazal’s doll collection, (3/5)th of the dolls are Barbie dolls, an

Pick a number which is which is a lcm of 5 and 7 to make the calculation easier.
Let the total be 35k.
barbie = 3/5 * 35k = 21k ; Non Barbie = 14k

Out of 21k , 4/7 purchased below age of 10 = 12k.
Therefore , 9k > age of 10.
Given , 9k = 90 ; k = 10

Total non barbie doll = 14k = 140

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