"a number minus twice" means nothing. "twice the number" means 2 times a number
"A number minus twice" is a common phrase I've heard as well, and did confuse me in the question paper, it does mean literally "minus twice" so minus it and minus it again, which would look like -2x. x being "a number" so "7 minus a number twice" would be 7-2x
I love english, the grammer makes maths so much harder.
I disagree. It is simply bad grammar.
You said "minus a number twice" which is NOT the same as "minus twice".and did confuse me in the question paper, it does mean literally "minus twice" so minus it and minus it again, which would look like -2x. x being "a number" so "7 minus a number twice" would be 7-2x
I love english, the grammer makes maths so much harder.