In an action by a real estate broker for commissions, a charge that if the purchasers were accepted by defendant as satisfactory, the verdict should be for plaintiff, but, if not, to authorize a recovery it must be shown that the purchasers were ready, willing and able to perform their part of the contract, within a reasonable time from that named therein, was inconsistent with another charge that the contract had been ratified and confirmed by defendant and was binding on him. Flynn v. Jordal, 124 Iowa, 457, 100 N. W. 326.