balance-scale/2-item/expert · Série 81

20 problems
1
Balance the scale: 7 + 10 15 + ? =
2
Balance the scale: 1 + __ 7 =
3
Balance the scale: 5 + 4 1 + ? =
4
Balance the scale: 5 + 10 1 + ? =
5
If left side 5 × 9, what does the right side equal to balance the scale? =
6
Balance the scale: 8 + __ 10 =
7
Balance the scale: 10 + 8 10 + ? =
8
If left side 6 × 7, what does the right side equal to balance the scale? =
9
Balance the scale: 7 + __ 9 =
10
Balance the scale: 3 + __ 9 =
11
Balance the scale: 3 + __ 4 =
12
Balance the scale: 4 + 5 3 + ? =
13
Balance the scale: 3 + 6 3 + ? =
14
Balance the scale: 1 + 8 6 + ? =
15
Balance the scale: 3 + 2 1 + ? =
16
Balance the scale: 5 + __ 7 =
17
Balance the scale: 4 + 1 4 + ? =
18
Balance the scale: 6 + 9 8 + ? =
19
Balance the scale: 4 + __ 8 =
20
Balance the scale: 9 + 9 8 + ? =
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