How would I go about solving this problem?

a granite contains150 parts per million (by atomic proportion) ppma of 235 U and 1050 ppma of 207 Pb. Using the decay rate from above, how old is this rock?

My teacher said the answer was 2100. How did he get that?

(Radio active isotope)
uranium 235

(1/2-life)
704myr

(age range)
10M-4.6byr

(daughter product)
Lead 207

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