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7/7 of Wooden piece A = 42 cm

1/7 of Wooden piece A = 42 ÷ 7 = 6cm

5/7 of Wooden piece A = 5 x 6 = 30 cm

3/5 of Wooden piece B = 30 cm

1/5 of Wooden piece B = 30 ÷ 3 = 10 cm

5/5 of Wooden piece B = 5 x 10 = 50 cm ans

CHIJ 2018 SA1 

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42 / 7 = 6 (A is divided by 7 equal parts)

6 x 5 = 30 (middle 5 parts are of 30cm, in total)

30 / 3 = 10 (For B, it is 3 parts)

10 x 5 = 50(cm) (B in total)

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