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Total -> 84

Wk 1 -> 25% × 84 = 21

Wk 1 + Wk 2 =  21 + 28 = 49

Wk 3 -> 35

49 ÷ 35 = 1.4 (Wk1 + Wk2 is 40% more than Wk3 as given)

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(a)
first week ——- 25%
second week ——- 28
third week ——- 10u

100% – 25% = 75% ——- 28 + 10u
25% + 28 ——- 1.4 x 10u = 14u
75% ——- (14u – 28) x 3 = 42u – 84
42u – 84 ——- 28 + 10u
1u ——- (28 + 84)/(42 – 10) = 3.5
10u ——- 10 x 3.5 = 35

(b)
75% ——- 28 + 35 = 63
100% ——- (63 x 100/75) = 84

Ans : (a) 35 cushions; (b) 84 cushions.

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