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Question

hi, can help us solve this question? thank you!

Source: Methodist Girls’ School Primary

Answer

Hi Mrs Marcus,

There may be a typo error in option 4. Should it be 46 instead of 45?

My working is based on the assumption of option 4  is 46.

Working:

Listing of the multiples of each number for Red Beads (need multiples that have ‘0’ in ones place)

30 : 30, 60, 90, 120

32 : 32, 64, 96, 128, 160

36 : 72, 108, 144, 180

46 : 46, 92, 138, 184, 230

Black Beads (Boxes) Black Beads (Number) Number of Red Beads No of Red Beads in a Box
1 box 70 300 – 70 = 230 46
2 boxes 140 300 – 140 = 160 32
3 boxes 210 300 – 210 = 90 30
4 boxes 280 300 – 280 = 20 No option

Answer: (3) 36

 

 

 

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