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(a)
chocolate cookies :
3u – 132 ——- 2p
6u – 264 ——- 4p

macadamia cookies :
2u – 92 ——- 1p
6u – 276 ——- 3p

4p – 3p = 1p ——- 276 – 264 = 12
3p ——- 12 x 3 = 36

(b)
36 x 0.50 = 18
18 – 11 = 7
7 x 4 = 28
36 – 28 = 8

Ans : (a) 36 cookies; (b) 8 cookies.

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  Chocolate cookies Macadamia cookies
At first  3u 2u
Gave away 132 92
Remaining 3u – 132 2u – 92
Ratio 2 1

 

3u – 132 = 2 × (2u – 92)

3u – 132 = 4u – 184

u = 52

(a) Number of cookies in the end -> (3u – 132) + (2u – 92) = 36

 

Cookies sold in packets of 4 for $1 –> 1 for 25¢

Assume all 36 sold at 25¢ each.

36 × 25¢ = $9

$11 – $9 = $2 = 200¢

50¢ – 25¢ = 25¢

200 ÷ 25 = 8

(b) Cookies sold at 50¢ each -> 8

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