14 out of 9 - (5 out of 13 + 5 out of 9)

14 out of 9 - (5 out of 13 + 5 out of 9)

14/9 - (5/13+5/9)
= 14/9 -5/13 -5/9
= 14/9 -5/9 -5/13
= 1 -5/13
= 8/13
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Can you calculate 4:17 * 19:15 + 14:15 * 13:4:17,

4 and 17 / 3 * 19 and 15 / 2 + 14 and 15 / 13 * 4 and 17 / 3
=(2 of 19 and 15 + 13 of 14 and 15) * 3 of 4 and 17
=34 * 4 and 3 / 17
=34 * 4 + 34 * 3 / 17
=136+6
=142

3 and 15:13 minus 2 and 14:13 plus 5 and 15:2 minus 4:5

3 and 15:13 minus 2 and 14:13 plus 5 and 15:2 minus 4:5
=3 and 15 / 13 + 5 and 15 / 2 - (2 and 14 / 13 + 4 / 5)
=9-4 and 9 / 52
=4 and 43 / 52

14 times 5 out of 13 times 2 out of 7

14 times 5 out of 13 times 2 out of 7
=14×2/7×5/13
=4×5/13
=20/13

Simple operation of 98 △ 1 / 15 △ 2 / 7

98÷(1/15÷2/7)
=98÷1/15×2/7
=98×2/7×15
=28×15
=420

Simple calculation of 7.2 × 1.98
fast

7.2×1.98
=7.2×(2-0.02)
=7.2×2-7.2×0.02
=14.4-0.144
=14.256

The simple operation of 0.54 × (16.7 + 1.25) × 3.2

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1 / 4 * 54 / 7 + 0.25 * 23 / 7 + 1 / 4 = simple calculation
1 / 4 * 7 + 5 / 7 + 0.25 * 3 + 2 / 7 + 1 / 4 = simple calculation

25 = 1 / 4, so the above is (54 / 7 + 23 / 7) * 1 / 4 + 1 / 4 = 11 * 1 / 4 + 1 / 4 = 12 * 1 / 4 = 3

A. The average of B and C is 70, a is 2 / 3 of B, B is 4 / 5 of C, find a is (), B is (), C is ()? Where
A. The average of B and C is 70, a is 2 / 3 of B, B is 4 / 5 of C, find a is (), B is (), C is ()?

A + 3 / 2 A + 3 / 2 a 5 / 4 = 210, a = 48. B = 72. C = 90

Given that the average of a, B and C is 70, a: B = 2:3, B: C = 4:5, then a = how much, B = how much

a:b=2:3=8:12,
b:c=4:5=12:15,
a:b:c=8:12:15,
70*3=210,
8+12+15=35
a=210*8/35=48,
b=210*12/35=72
c=210*15/35=120