2
Multiply 473*.30 which equals 142.9. Or multiply 473*.70 which equals 331.1 then subtract the product from original number. So 473 minus 331.1 equals 142.9 which proves the first method.
Pick a number between 8 and 20. double that number. subtract 16 from that answer. Multiply that result by 4. Divide that total by 8. add 15 to that answer. subtract the number that you started with.
You get 4 more than you started with.
Multiply the original number by 0.9
Divide the new number by the original number, subtract '1', and multiply by 100.
7
Multiply 473*.30 which equals 142.9. Or multiply 473*.70 which equals 331.1 then subtract the product from original number. So 473 minus 331.1 equals 142.9 which proves the first method.
Using algebra the number works out as 25
Pick a number between 8 and 20. double that number. subtract 16 from that answer. Multiply that result by 4. Divide that total by 8. add 15 to that answer. subtract the number that you started with.
Multiply the number by 0.75
You get 4 more than you started with.
8
Multiply the original number by 0.9
9n-107. Where n is the chosen number .
it means multiply the the number in the ones place by two and use that number to subtract
Multiply the number by the percent in decimal form, and subtract the result from the original number. Alternatively, multiply the number by (1 - the percent).
Divide the new number by the original number, subtract '1', and multiply by 100.