The phrase "allowances of three" is correct and usable in written English.
It can be used in contexts where you are discussing provisions, adjustments, or considerations that involve the number three.
Example: "The budget includes allowances of three for each department to account for unexpected expenses."
Alternatives: "provisions for three" or "adjustments of three".
According to one pastor, many of the elderly people in the church are single women who live on Social Security allowances of four or five thousand dollars a year.
Migrants are entitled to daily cash allowances of two euros and fifty cents; at Palanebiolo, they were given phone cards instead, which they sold on the streets nearby at a thirty-per-cent discount, so they could buy food, secondhand clothes, and, eventually, mobile phones.
Back on the estate, Matthews and his colleague, Dave Brown, have only managed to speak to four residents with recyclables in their fortnightly allowance of three black bin bags.
The left data were then aligned with Human genome and exon junction database for annotation successively, with the allowance of three mismatches.
There is a maximum allowance of one Walter Mitty per household, that's just how it goes.
Planes flying internationally also have a more flexible allowance of four hours.
Gene models within the syntenic blocks were compared based on a sliding window representing 10 gene models with an allowance of two intercalated gene models.
At Verizon, the cost of the same iPhone was $200, but a similar monthly plan — with a data allowance of two gigabytes — was $100 a month, bringing the cost up to $2,600 for two years.
To impress him further with the value of money, he gave the boy a weekly allowance of five cents, in pennies, payable on presentation of a budget allocating every cent of it.
The new program might still be called Medicare — hey, we could replace government coverage of major expenses with an allowance of two free aspirins a day, and still call it "Medicare" — but it wouldn't be the same program.
