Find the number that can be subtracted from both terms of the ratio 43 : 91 so that the ratio becomes 3 : 7.

Find the number that can be subtracted from both terms of the ratio 43 : 91 so that the ratio becomes 3 : 7.
अनुपात 43 : 91 के दोनों पदों से घटाई जा सकने वाली संख्या ज्ञात कीजिए जिससे कि अनुपात 3 : 7 हो जाए।