7
15% of 123 = 15% * 123 = 0.15 * 123 = 18.45
23
If x + 7 = 15, then 15 - 7 = x, therefore x = 8.If x = 8, then 4x is equal to 4 x 8 = 32.
22
Suppose the smaller number is x, then the bigger number is x+7 Their sum is 123 ie x + (x+7) = 123 or 2x + 7 = 123 or 2x = 123 - 7 = 116 so that x = 58 and then x+7 = 65 The two numbers are 58 and 65
41 times 3 equals 123.
The first ten positive integer multiples of 123 are: 1 x 123 = 123 2 x 123 = 246 3 x 123 = 369 4 x 123 = 492 5 x 123 = 615 6 x 123 = 738 7 x 123 = 861 8 x 123 = 984 9 x 123 = 1107 10 x 123 = 1230
15.375
7
123 m3 is 1.23 x 10-7 km3
105.....see below 7 x 2 = 14 15 x 2 = 30 7 x 3 = 21 15 x 3 = 45 7 x 4 = 28 15 x 4 = 60 7 x 5 = 35 15 x 5 = 75 7 x 6 = 42 15 x 6 = 90 7 x 7 = 49 15 x 7 = 105 7 x 8 = 56 7 x 9 = 63 7 x 10 = 70 7 x 11 = 77 7 x 12 = 84 7 x 13 = 91 7 x 14 = 98 7 x 15 = 105
x - 7 = 8 x = 7 + 8 x = 15
15% of 123 = 15% * 123 = 0.15 * 123 = 18.45
7+x=15 x=8
22
123 = 1 x 123, 3 x 41, 41 x 3, 123 x 1