(1) 15 of a number is 3.6 less than 1.6 times of 4.5. Find this number. (2) what is the difference between 6 divided by 67 and 6 divided by 67?

(1) 15 of a number is 3.6 less than 1.6 times of 4.5. Find this number. (2) what is the difference between 6 divided by 67 and 6 divided by 67?

(1) (4.5 × 1.6-3.6) △ 15, = (7.2-3.6) × 5, = 3.6 × 5, = 18; answer: this number is 18. (2) 6 △ 67-67 △ 6, = 6 × 76-67 × 16, = 7-17, = 667; answer: the difference is 667